Analysis
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max time kernel
150s -
max time network
152s -
platform
windows7_x64 -
resource
win7-20240704-en -
resource tags
arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system -
submitted
29-07-2024 16:58
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240704-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
9a4f3b0223e0bcb90d5a08afdae6a169
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SHA1
b8ea3a64121a47f7a7abc73fc9a39d912b31a724
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SHA256
031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104
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SHA512
38ab6b70078807bc8c56f5c004ae4ef4a40690ec26bc896213a158765530caec5812b556a5555037ac986175fb1d4d588f1a982dd5e383a8c5734783507f6601
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SSDEEP
49152:SvHI22SsaNYfdPBldt698dBcjHJwRJ6cbR3LoGdFgTHHB72eh2NT:Svo22SsaNYfdPBldt6+dBcjHJwRJ6m
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.70:4782
34828de8-c350-4dd4-85c9-16051c0443f7
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encryption_key
2F1B645695C7578786A6BD1B6CD3966DFF24BC11
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install_name
sigmaexecutor.exe.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
WIndows Updater
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subdirectory
SubDir
Signatures
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Quasar payload 3 IoCs
Processes:
resource yara_rule behavioral1/memory/332-1-0x0000000001130000-0x0000000001454000-memory.dmp family_quasar C:\Windows\System32\SubDir\sigmaexecutor.exe.exe family_quasar behavioral1/memory/2084-8-0x0000000001380000-0x00000000016A4000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
Processes:
sigmaexecutor.exe.exepid process 2084 sigmaexecutor.exe.exe -
Drops file in System32 directory 5 IoCs
Processes:
Client-built.exesigmaexecutor.exe.exedescription ioc process File created C:\Windows\system32\SubDir\sigmaexecutor.exe.exe Client-built.exe File opened for modification C:\Windows\system32\SubDir\sigmaexecutor.exe.exe Client-built.exe File opened for modification C:\Windows\system32\SubDir Client-built.exe File opened for modification C:\Windows\system32\SubDir\sigmaexecutor.exe.exe sigmaexecutor.exe.exe File opened for modification C:\Windows\system32\SubDir sigmaexecutor.exe.exe -
Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 2404 schtasks.exe 2700 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exesigmaexecutor.exe.exedescription pid process Token: SeDebugPrivilege 332 Client-built.exe Token: SeDebugPrivilege 2084 sigmaexecutor.exe.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
sigmaexecutor.exe.exepid process 2084 sigmaexecutor.exe.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
Client-built.exesigmaexecutor.exe.exedescription pid process target process PID 332 wrote to memory of 2404 332 Client-built.exe schtasks.exe PID 332 wrote to memory of 2404 332 Client-built.exe schtasks.exe PID 332 wrote to memory of 2404 332 Client-built.exe schtasks.exe PID 332 wrote to memory of 2084 332 Client-built.exe sigmaexecutor.exe.exe PID 332 wrote to memory of 2084 332 Client-built.exe sigmaexecutor.exe.exe PID 332 wrote to memory of 2084 332 Client-built.exe sigmaexecutor.exe.exe PID 2084 wrote to memory of 2700 2084 sigmaexecutor.exe.exe schtasks.exe PID 2084 wrote to memory of 2700 2084 sigmaexecutor.exe.exe schtasks.exe PID 2084 wrote to memory of 2700 2084 sigmaexecutor.exe.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.
Processes
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C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:332 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "WIndows Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\sigmaexecutor.exe.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:2404 -
C:\Windows\system32\SubDir\sigmaexecutor.exe.exe"C:\Windows\system32\SubDir\sigmaexecutor.exe.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2084 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "WIndows Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\sigmaexecutor.exe.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:2700
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD59a4f3b0223e0bcb90d5a08afdae6a169
SHA1b8ea3a64121a47f7a7abc73fc9a39d912b31a724
SHA256031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104
SHA51238ab6b70078807bc8c56f5c004ae4ef4a40690ec26bc896213a158765530caec5812b556a5555037ac986175fb1d4d588f1a982dd5e383a8c5734783507f6601