remcos | 3aae90682e6e388e729b635380876409c38d7fe52a4581d45778258e8378b795

Analysis

max time kernel
1384s
max time network
1172s
platform
windows10-2004_x64
resource
win10v2004-20240611-en
resource tags

arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
submitted
01-07-2024 16:28

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General

Target

pacuka.exe
Size

92KB
MD5

16653b45d28e26bd88f741bd8e62f7a6
SHA1

1bd612b271d4b010ea4f1cab6658afaa15fac347
SHA256

3aae90682e6e388e729b635380876409c38d7fe52a4581d45778258e8378b795
SHA512

bf12f0f4819af831c3b30e4b826167e7e786c75f429fa1434d2c8495d78c2541bf777b00e2205a4eb7b94fc66b72401753ee693ca802a935dac210f7ca00ba0c
SSDEEP

1536:YhhW0YTGZWdVseJxaM9kraLdV2QkQ1TbPX8IHOCkIsI4ESHNTh9E+JP19qkP6irT:+hzYTGWVvJ8f2v1TbPzuMsIFSHNThy+9

Score

10^/10

remcos host evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

185.254.97.15:2404

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
packu.exe
copy_folder
skid
delete_file
false
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%SystemDrive%
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%WinDir%\System32
mouse_option
false
mutex
rukbdcxfoo
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
Discord
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

reg.exereg.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

pacuka.exepacku.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3169499791-3545231813-3156325206-1000\Control Panel\International\Geo\Nation	pacuka.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3169499791-3545231813-3156325206-1000\Control Panel\International\Geo\Nation	packu.exe

Executes dropped EXE 1 IoCs

Processes:

packu.exe

pid process

2276 packu.exe

pid	process
2276	packu.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

packu.exepacuka.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Discord = "\"C:\\skid\\packu.exe\""	packu.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3169499791-3545231813-3156325206-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Discord = "\"C:\\skid\\packu.exe\""	pacuka.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Discord = "\"C:\\skid\\packu.exe\""	pacuka.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3169499791-3545231813-3156325206-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Discord = "\"C:\\skid\\packu.exe\""	packu.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Modifies registry key 1 TTPs 2 IoCs

Modify Registry
T1112

Processes:

reg.exereg.exe

pid process

4320 reg.exe
3916 reg.exe
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

4284 PING.EXE
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

packu.exe

pid process

2276 packu.exe

pid	process
4320	reg.exe
3916	reg.exe

pid	process
4284	PING.EXE

pid	process
2276	packu.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

pacuka.execmd.execmd.exepacku.execmd.exe

description	pid	process	target process
PID 3852 wrote to memory of 4976	3852	pacuka.exe	cmd.exe
PID 3852 wrote to memory of 4976	3852	pacuka.exe	cmd.exe
PID 3852 wrote to memory of 4976	3852	pacuka.exe	cmd.exe
PID 4976 wrote to memory of 4320	4976	cmd.exe	reg.exe
PID 4976 wrote to memory of 4320	4976	cmd.exe	reg.exe
PID 4976 wrote to memory of 4320	4976	cmd.exe	reg.exe
PID 3852 wrote to memory of 1640	3852	pacuka.exe	cmd.exe
PID 3852 wrote to memory of 1640	3852	pacuka.exe	cmd.exe
PID 3852 wrote to memory of 1640	3852	pacuka.exe	cmd.exe
PID 1640 wrote to memory of 4284	1640	cmd.exe	PING.EXE
PID 1640 wrote to memory of 4284	1640	cmd.exe	PING.EXE
PID 1640 wrote to memory of 4284	1640	cmd.exe	PING.EXE
PID 1640 wrote to memory of 2276	1640	cmd.exe	packu.exe
PID 1640 wrote to memory of 2276	1640	cmd.exe	packu.exe
PID 1640 wrote to memory of 2276	1640	cmd.exe	packu.exe
PID 2276 wrote to memory of 4444	2276	packu.exe	cmd.exe
PID 2276 wrote to memory of 4444	2276	packu.exe	cmd.exe
PID 2276 wrote to memory of 4444	2276	packu.exe	cmd.exe
PID 2276 wrote to memory of 2712	2276	packu.exe	iexplore.exe
PID 2276 wrote to memory of 2712	2276	packu.exe	iexplore.exe
PID 2276 wrote to memory of 2712	2276	packu.exe	iexplore.exe
PID 4444 wrote to memory of 3916	4444	cmd.exe	reg.exe
PID 4444 wrote to memory of 3916	4444	cmd.exe	reg.exe
PID 4444 wrote to memory of 3916	4444	cmd.exe	reg.exe
PID 2276 wrote to memory of 3120	2276	packu.exe	cmd.exe
PID 2276 wrote to memory of 3120	2276	packu.exe	cmd.exe
PID 2276 wrote to memory of 3120	2276	packu.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\pacuka.exe
"C:\Users\Admin\AppData\Local\Temp\pacuka.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:3852

C:\Windows\SysWOW64\cmd.exe
/k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
2⤵
- Suspicious use of WriteProcessMemory
PID:4976

C:\Windows\SysWOW64\reg.exe
C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
3⤵
- UAC bypass
- Modifies registry key
PID:4320

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
2⤵
- Suspicious use of WriteProcessMemory
PID:1640

C:\Windows\SysWOW64\PING.EXE
PING 127.0.0.1 -n 2
3⤵
- Runs ping.exe
PID:4284

C:\skid\packu.exe
"C:\skid\packu.exe"
3⤵
- Checks computer location settings
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2276

C:\Windows\SysWOW64\cmd.exe
/k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
4⤵
- Suspicious use of WriteProcessMemory
PID:4444

C:\Windows\SysWOW64\reg.exe
C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
5⤵
- UAC bypass
- Modifies registry key
PID:3916

C:\Program Files (x86)\Internet Explorer\iexplore.exe
"C:\Program Files (x86)\Internet Explorer\iexplore.exe"
4⤵
PID:2712

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\uninstall.bat" "
4⤵
PID:3120

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.bat
Filesize
68B

MD5
086c6015cf0c1deb685322e0d160d756

SHA1
d5d29e7db31ed1443cdf5d881e66851287c03e87

SHA256
10b2265ccd77e0536d3a5652a0532228a38123aee20e6aa01e74db491a356544

SHA512
cd5c9ba83f7669130bbfdde8681e0174afe2aed932f9f9cee713c6ce77c6c8fa3aad798235e653b5aafc1779b42fff01bf63497bd6dec2a8b93905f5cd500a7d

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C:\Users\Admin\AppData\Local\Temp\uninstall.bat
Filesize
110B

MD5
98408dd2e8a07956418230602f43bd55

SHA1
6680dd5a2a4466f206568eb1856636b527ea8de1

SHA256
df6065623a997a9b0bb357f3e20ded4c62576db800ef016d44f05fe85a48f4c6

SHA512
b51f2598179d85cadce02196e5c99d5a3d5e7a6e90495730c0c1ac0d888bc69c1b63495fd17c0a8acd0ad1bd241ca8322de982a42817c5386b1c9511cc0fd976

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C:\skid\packu.exe
Filesize
92KB

MD5
16653b45d28e26bd88f741bd8e62f7a6

SHA1
1bd612b271d4b010ea4f1cab6658afaa15fac347

SHA256
3aae90682e6e388e729b635380876409c38d7fe52a4581d45778258e8378b795

SHA512
bf12f0f4819af831c3b30e4b826167e7e786c75f429fa1434d2c8495d78c2541bf777b00e2205a4eb7b94fc66b72401753ee693ca802a935dac210f7ca00ba0c

Download Submit