quasar | ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862

Analysis

max time kernel
149s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
01-07-2024 01:57

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General

Target

ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exe
Size

3.1MB
MD5

1633db1ce0d5eae8b246019541b00372
SHA1

00b8f4ede2ca86fd53b3012e4a317318a20dd39b
SHA256

ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862
SHA512

3843b4ad7b2a6d7dd8220f4dd30952a3f6d9918c1391234d3fc2abfcd2adcfd33a6d161a9ad562df661149dedaf5b0589484eb053fdb35c3f41983066e22751a
SSDEEP

49152:rvzlL26AaNeWgPhlmVqvMQ7XSKY9BSPnaMYLowdseTHHB72eh2NT:rvpL26AaNeWgPhlmVqkQ7XSK+oPY

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.111:4782

Mutex

1f5e43b0-2e6e-4529-bedf-628650591bdf

Attributes

encryption_key
0FF1E4E83CF341CB74C4BB8B5D7980A41A9AF65B
install_name
DescryptMain.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar payload 2 IoCs

Processes:

resource yara_rule

behavioral2/memory/5024-1-0x00000000000B0000-0x00000000003D4000-memory.dmp family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\DescryptMain.exe family_quasar

resource	yara_rule
behavioral2/memory/5024-1-0x00000000000B0000-0x00000000003D4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\DescryptMain.exe	family_quasar

Detects Windows executables referencing non-Windows User-Agents 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/5024-1-0x00000000000B0000-0x00000000003D4000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
C:\Users\Admin\AppData\Roaming\SubDir\DescryptMain.exe	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/5024-1-0x00000000000B0000-0x00000000003D4000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
C:\Users\Admin\AppData\Roaming\SubDir\DescryptMain.exe	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/5024-1-0x00000000000B0000-0x00000000003D4000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
C:\Users\Admin\AppData\Roaming\SubDir\DescryptMain.exe	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

Processes:

DescryptMain.exe

pid process

1092 DescryptMain.exe
Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence execution

Scheduled Task
T1053.005

Processes:

schtasks.exeschtasks.exe

pid process

1144 schtasks.exe
4140 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exeDescryptMain.exe

description pid process

Token: SeDebugPrivilege 5024 ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exe
Token: SeDebugPrivilege 1092 DescryptMain.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

DescryptMain.exe

pid process

1092 DescryptMain.exe

pid	process
1092	DescryptMain.exe

pid	process
1144	schtasks.exe
4140	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	5024	ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exe
Token: SeDebugPrivilege	1092	DescryptMain.exe

pid	process
1092	DescryptMain.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exeDescryptMain.exe

description	pid	process	target process
PID 5024 wrote to memory of 1144	5024	ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exe	schtasks.exe
PID 5024 wrote to memory of 1144	5024	ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exe	schtasks.exe
PID 5024 wrote to memory of 1092	5024	ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exe	DescryptMain.exe
PID 5024 wrote to memory of 1092	5024	ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exe	DescryptMain.exe
PID 1092 wrote to memory of 4140	1092	DescryptMain.exe	schtasks.exe
PID 1092 wrote to memory of 4140	1092	DescryptMain.exe	schtasks.exe

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exe
"C:\Users\Admin\AppData\Local\Temp\ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5024

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\DescryptMain.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:1144

C:\Users\Admin\AppData\Roaming\SubDir\DescryptMain.exe
"C:\Users\Admin\AppData\Roaming\SubDir\DescryptMain.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1092

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\DescryptMain.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:4140

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\DescryptMain.exe
Filesize
3.1MB

MD5
1633db1ce0d5eae8b246019541b00372

SHA1
00b8f4ede2ca86fd53b3012e4a317318a20dd39b

SHA256
ba81b05c43bae8ee850ebff1ca399808b4828e5455ad2b2f9e64dd7962c33862

SHA512
3843b4ad7b2a6d7dd8220f4dd30952a3f6d9918c1391234d3fc2abfcd2adcfd33a6d161a9ad562df661149dedaf5b0589484eb053fdb35c3f41983066e22751a

Download Submit
memory/1092-10-0x00007FFBF0D80000-0x00007FFBF1841000-memory.dmp

Filesize
10.8MB

Download
memory/1092-11-0x00007FFBF0D80000-0x00007FFBF1841000-memory.dmp

Filesize
10.8MB

Download
memory/1092-12-0x000000001BAB0000-0x000000001BB00000-memory.dmp

Filesize
320KB

Download
memory/1092-13-0x000000001C310000-0x000000001C3C2000-memory.dmp

Filesize
712KB

Download
memory/1092-14-0x00007FFBF0D80000-0x00007FFBF1841000-memory.dmp

Filesize
10.8MB

Download
memory/5024-1-0x00000000000B0000-0x00000000003D4000-memory.dmp

Filesize
3.1MB

Download
memory/5024-0-0x00007FFBF0D83000-0x00007FFBF0D85000-memory.dmp

Filesize
8KB

Download
memory/5024-2-0x00007FFBF0D80000-0x00007FFBF1841000-memory.dmp

Filesize
10.8MB

Download
memory/5024-9-0x00007FFBF0D80000-0x00007FFBF1841000-memory.dmp

Filesize
10.8MB

Download