Analysis
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max time kernel
18s -
max time network
22s -
platform
windows10-2004_x64 -
resource
win10v2004-20240730-en -
resource tags
arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system -
submitted
30-07-2024 17:47
Behavioral task
behavioral1
Sample
SRCkey.exe
Resource
win10v2004-20240730-en
General
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Target
SRCkey.exe
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Size
3.1MB
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MD5
d0fa55b027cf3268483208bc5087bf14
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SHA1
758d9396522e8458159bb7b5186340caf767f691
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SHA256
c1fba0fc260e24b6f42a72d8725aac400465890e5ee1a422cd567229ec1609bc
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SHA512
418ae9524de8f7326fe77c2664f1cdf2f807c0a50fe6e2619cc32fb863eff08a1b3ec26c029f1e319f540e9074380e8ca2dc9fb3f65e0cb2d26947037967f48b
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SSDEEP
49152:PvyI22SsaNYfdPBldt698dBcjHkrRJ6VbR3LoGdGTHHB72eh2NT:Pvf22SsaNYfdPBldt6+dBcjHkrRJ6n
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.8.180:4782
b532486b-fe2e-45a2-ac9b-42f784c55957
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encryption_key
33E00C0591CE60DF8D1A4C8EBCF120A2AD5D348C
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Microsoft defender
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral1/memory/1880-1-0x00000000001C0000-0x00000000004E4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 4708 Client.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 1072 schtasks.exe 3776 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
SRCkey.exeClient.exedescription pid process Token: SeDebugPrivilege 1880 SRCkey.exe Token: SeDebugPrivilege 4708 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 4708 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
SRCkey.exeClient.exedescription pid process target process PID 1880 wrote to memory of 1072 1880 SRCkey.exe schtasks.exe PID 1880 wrote to memory of 1072 1880 SRCkey.exe schtasks.exe PID 1880 wrote to memory of 4708 1880 SRCkey.exe Client.exe PID 1880 wrote to memory of 4708 1880 SRCkey.exe Client.exe PID 4708 wrote to memory of 3776 4708 Client.exe schtasks.exe PID 4708 wrote to memory of 3776 4708 Client.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\SRCkey.exe"C:\Users\Admin\AppData\Local\Temp\SRCkey.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1880 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Microsoft defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:1072 -
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4708 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Microsoft defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:3776
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5d0fa55b027cf3268483208bc5087bf14
SHA1758d9396522e8458159bb7b5186340caf767f691
SHA256c1fba0fc260e24b6f42a72d8725aac400465890e5ee1a422cd567229ec1609bc
SHA512418ae9524de8f7326fe77c2664f1cdf2f807c0a50fe6e2619cc32fb863eff08a1b3ec26c029f1e319f540e9074380e8ca2dc9fb3f65e0cb2d26947037967f48b