Analysis
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max time kernel
147s -
max time network
156s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
08-04-2024 22:28
Behavioral task
behavioral1
Sample
745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe
Resource
win7-20240221-en
General
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Target
745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe
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Size
3.1MB
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MD5
ed8542b4688d70d42d77fad98e5969b0
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SHA1
808666505eeca15e9a7a15b95ff439497a9f1dcf
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SHA256
745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002
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SHA512
72fc0930a4e51eb7a7b76bac97c64c9bb8e8fe30a406b294a824ecc721677c212d409368a6bca595b0ee82449d80cf7c09f4a063bbe7ee47ebcba30c5c3b6a45
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SSDEEP
49152:KvyI22SsaNYfdPBldt698dBcjH672lSt3oGdITHHB72eh2NT:Kvf22SsaNYfdPBldt6+dBcjH62lS9
Malware Config
Extracted
quasar
1.4.1
Office04
10.127.0.54:4782
76898c6c-aad7-493e-ad05-6bb072bc1ab9
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encryption_key
E0AA33A7353AC58B6995079C718A83EE5609573D
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install_name
Twrek.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/1008-0-0x00000000006C0000-0x00000000009E4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe family_quasar -
Detects Windows executables referencing non-Windows User-Agents 2 IoCs
Processes:
resource yara_rule behavioral2/memory/1008-0-0x00000000006C0000-0x00000000009E4000-memory.dmp INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA C:\Users\Admin\AppData\Roaming\SubDir\Twrek.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/1008-0-0x00000000006C0000-0x00000000009E4000-memory.dmp INDICATOR_SUSPICIOUS_Binary_References_Browsers C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe INDICATOR_SUSPICIOUS_Binary_References_Browsers -
Detects executables containing common artifacts observed in infostealers 2 IoCs
Processes:
resource yara_rule behavioral2/memory/1008-0-0x00000000006C0000-0x00000000009E4000-memory.dmp INDICATOR_SUSPICIOUS_GENInfoStealer C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe INDICATOR_SUSPICIOUS_GENInfoStealer -
Executes dropped EXE 1 IoCs
Processes:
Twrek.exepid process 4264 Twrek.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 1044 schtasks.exe 2488 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exeTwrek.exedescription pid process Token: SeDebugPrivilege 1008 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe Token: SeDebugPrivilege 4264 Twrek.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Twrek.exepid process 4264 Twrek.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exeTwrek.exedescription pid process target process PID 1008 wrote to memory of 1044 1008 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe schtasks.exe PID 1008 wrote to memory of 1044 1008 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe schtasks.exe PID 1008 wrote to memory of 4264 1008 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe Twrek.exe PID 1008 wrote to memory of 4264 1008 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe Twrek.exe PID 4264 wrote to memory of 2488 4264 Twrek.exe schtasks.exe PID 4264 wrote to memory of 2488 4264 Twrek.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\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe"C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1008 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:1044 -
C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe"C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4264 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:2488
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5ed8542b4688d70d42d77fad98e5969b0
SHA1808666505eeca15e9a7a15b95ff439497a9f1dcf
SHA256745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002
SHA51272fc0930a4e51eb7a7b76bac97c64c9bb8e8fe30a406b294a824ecc721677c212d409368a6bca595b0ee82449d80cf7c09f4a063bbe7ee47ebcba30c5c3b6a45