remcos | 5abf99b5cb761cf5e1b14a3cf9f0edfff6b932592772aa422e2d1a691fe25432

Analysis

max time kernel
599s
max time network
600s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
01-07-2024 13:48

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General

Target

unpacker.exe
Size

92KB
MD5

1ae56ec879a82b9d0b34637cdbb498ef
SHA1

523c2d5e3864c0be7593f7cb8d3cc5ef8391eba0
SHA256

5abf99b5cb761cf5e1b14a3cf9f0edfff6b932592772aa422e2d1a691fe25432
SHA512

4a5d836330d0e3a8451a83b31c9b122f6b0aff27a58ea97f8a07bb9dc22c19835b80e5588957551da645e5c7299193e32945287e709dd8579d30ec89fdb27bf7
SSDEEP

1536:ohhW0YTGZWdVseJxaM9kraLdV2QkQ1TbPX8IHOCkIsI4ESHNTh9E+JP19qkP6XrE:uhzYTGWVvJ8f2v1TbPzuMsIFSHNThy+D

Score

10^/10

remcos host persistence rat

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
remcos.exe
copy_folder
remcos
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
%AppData%
mouse_option
false
mutex
remcos_rukbdcxfoo
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Executes dropped EXE 1 IoCs

Processes:

remcos.exe

pid process

788 remcos.exe

pid	process
788	remcos.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

unpacker.exeremcos.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-160447019-1232603106-4168707212-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\remcos\\remcos.exe\""	unpacker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\remcos\\remcos.exe\""	unpacker.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-160447019-1232603106-4168707212-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\remcos\\remcos.exe\""	remcos.exe

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

System Information Discovery
T1082
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

3836 PING.EXE
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

remcos.exe

pid process

788 remcos.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

remcos.exe

pid process

788 remcos.exe

pid	process
3836	PING.EXE

pid	process
788	remcos.exe

pid	process
788	remcos.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

unpacker.execmd.exeremcos.exe

description	pid	process	target process
PID 4704 wrote to memory of 4804	4704	unpacker.exe	cmd.exe
PID 4704 wrote to memory of 4804	4704	unpacker.exe	cmd.exe
PID 4704 wrote to memory of 4804	4704	unpacker.exe	cmd.exe
PID 4804 wrote to memory of 3836	4804	cmd.exe	PING.EXE
PID 4804 wrote to memory of 3836	4804	cmd.exe	PING.EXE
PID 4804 wrote to memory of 3836	4804	cmd.exe	PING.EXE
PID 4804 wrote to memory of 788	4804	cmd.exe	remcos.exe
PID 4804 wrote to memory of 788	4804	cmd.exe	remcos.exe
PID 4804 wrote to memory of 788	4804	cmd.exe	remcos.exe
PID 788 wrote to memory of 3640	788	remcos.exe	iexplore.exe
PID 788 wrote to memory of 3640	788	remcos.exe	iexplore.exe
PID 788 wrote to memory of 3640	788	remcos.exe	iexplore.exe

C:\Users\Admin\AppData\Local\Temp\unpacker.exe
"C:\Users\Admin\AppData\Local\Temp\unpacker.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4704

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:4804

C:\Windows\SysWOW64\PING.EXE
PING 127.0.0.1 -n 2
3⤵
- Runs ping.exe
PID:3836

C:\remcos\remcos.exe
"C:\remcos\remcos.exe"
3⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:788

C:\Program Files (x86)\Internet Explorer\iexplore.exe
"C:\Program Files (x86)\Internet Explorer\iexplore.exe"
4⤵
PID:3640

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.bat
Filesize
71B

MD5
80872ea3cf9abb62f560745ffa9beec3

SHA1
eca18379ab1a505c7d762fe3d12ca737d89e1adb

SHA256
e59cc939e7c948019a7fa687492222eac769c835c3e7338e16480925431d6948

SHA512
13e9c37d3f90ee55ef6783dbdff388aae99bbb1dd6bb7807d6e7ee56b496da2093a7bf28396d559a224134c8124caab52a4525a9d15eb46091bd3dc64f43824d

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C:\Users\Admin\AppData\Roaming\remcos\logs.dat
MD5
d41d8cd98f00b204e9800998ecf8427e

SHA1
da39a3ee5e6b4b0d3255bfef95601890afd80709

SHA256
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

SHA512
cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

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C:\remcos\remcos.exe
Filesize
92KB

MD5
1ae56ec879a82b9d0b34637cdbb498ef

SHA1
523c2d5e3864c0be7593f7cb8d3cc5ef8391eba0

SHA256
5abf99b5cb761cf5e1b14a3cf9f0edfff6b932592772aa422e2d1a691fe25432

SHA512
4a5d836330d0e3a8451a83b31c9b122f6b0aff27a58ea97f8a07bb9dc22c19835b80e5588957551da645e5c7299193e32945287e709dd8579d30ec89fdb27bf7

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