Analysis
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max time kernel
149s -
max time network
150s -
platform
windows7_x64 -
resource
win7-20240220-en -
resource tags
arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system -
submitted
28-06-2024 14:51
Behavioral task
behavioral1
Sample
1878733d5f2872169c33653a1ac9b623.exe
Resource
win7-20240220-en
General
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Target
1878733d5f2872169c33653a1ac9b623.exe
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Size
4.8MB
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MD5
1878733d5f2872169c33653a1ac9b623
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SHA1
738a018c2c738e93ffa6dce3932ee994aa7b11e3
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SHA256
f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115
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SHA512
bc0d3a8a84efcc80b7768efc0b4071722bdfdbb63c9ea9b5e45089257ee527772dfb9f2a259d10abf8ecc54c1816917d5a527bbd87adca333543cb0f1610a4b9
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SSDEEP
98304:EQfNOLY2uXHEvr22SsaNYfdPBldt6+dBcjHtKRJ6BJIbzZ3IbzZY:eQHSM7jGImWK
Malware Config
Extracted
quasar
1.4.1
Office04
mx5.deitie.asia:4495
ebbf737a-dddd-43dd-9b0a-74831302455d
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encryption_key
F8516D89A1DFD78BD8FF575BBC3AE828B47FF0E1
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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
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 3 IoCs
Processes:
resource yara_rule \Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe family_quasar behavioral1/memory/3068-6-0x0000000001050000-0x0000000001374000-memory.dmp family_quasar behavioral1/memory/2196-14-0x0000000000930000-0x0000000000C54000-memory.dmp family_quasar -
Drops startup file 1 IoCs
Processes:
1878733d5f2872169c33653a1ac9b623.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe 1878733d5f2872169c33653a1ac9b623.exe -
Executes dropped EXE 2 IoCs
Processes:
sign.exeClient.exepid process 3068 sign.exe 2196 Client.exe -
Loads dropped DLL 1 IoCs
Processes:
1878733d5f2872169c33653a1ac9b623.exepid process 2916 1878733d5f2872169c33653a1ac9b623.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 2952 schtasks.exe 2636 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 1 IoCs
Processes:
1878733d5f2872169c33653a1ac9b623.exepid process 2916 1878733d5f2872169c33653a1ac9b623.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
Processes:
1878733d5f2872169c33653a1ac9b623.exepid process 2916 1878733d5f2872169c33653a1ac9b623.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
sign.exeClient.exedescription pid process Token: SeDebugPrivilege 3068 sign.exe Token: SeDebugPrivilege 2196 Client.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
Processes:
1878733d5f2872169c33653a1ac9b623.exepid process 2916 1878733d5f2872169c33653a1ac9b623.exe 2916 1878733d5f2872169c33653a1ac9b623.exe -
Suspicious use of WriteProcessMemory 13 IoCs
Processes:
1878733d5f2872169c33653a1ac9b623.exesign.exeClient.exedescription pid process target process PID 2916 wrote to memory of 3068 2916 1878733d5f2872169c33653a1ac9b623.exe sign.exe PID 2916 wrote to memory of 3068 2916 1878733d5f2872169c33653a1ac9b623.exe sign.exe PID 2916 wrote to memory of 3068 2916 1878733d5f2872169c33653a1ac9b623.exe sign.exe PID 2916 wrote to memory of 3068 2916 1878733d5f2872169c33653a1ac9b623.exe sign.exe PID 3068 wrote to memory of 2952 3068 sign.exe schtasks.exe PID 3068 wrote to memory of 2952 3068 sign.exe schtasks.exe PID 3068 wrote to memory of 2952 3068 sign.exe schtasks.exe PID 3068 wrote to memory of 2196 3068 sign.exe Client.exe PID 3068 wrote to memory of 2196 3068 sign.exe Client.exe PID 3068 wrote to memory of 2196 3068 sign.exe Client.exe PID 2196 wrote to memory of 2636 2196 Client.exe schtasks.exe PID 2196 wrote to memory of 2636 2196 Client.exe schtasks.exe PID 2196 wrote to memory of 2636 2196 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\1878733d5f2872169c33653a1ac9b623.exe"C:\Users\Admin\AppData\Local\Temp\1878733d5f2872169c33653a1ac9b623.exe"1⤵
- Drops startup file
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\\sign.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f4⤵
- Scheduled Task/Job: Scheduled Task
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
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Downloads
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\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exeFilesize
3.1MB
MD57498d554976744dfbd271ba755c6c192
SHA1ec733d01e776518e387d2f51d1a6559b81f03b1e
SHA25644089202623b9671051aa5bba5e72f81f68ce818c3054dde57726aaa6dcb9ff7
SHA512d4e987d0e6235001fac4ae3a634e8fe98c6830e26a6a6876fbc36262842688d3ec301cff75003d2af695cdfd357ac50919946695b7d5d3293ebcba97153e1030
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memory/2196-14-0x0000000000930000-0x0000000000C54000-memory.dmpFilesize
3.1MB
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memory/3068-5-0x000007FEF59E3000-0x000007FEF59E4000-memory.dmpFilesize
4KB
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memory/3068-6-0x0000000001050000-0x0000000001374000-memory.dmpFilesize
3.1MB
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memory/3068-7-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmpFilesize
9.9MB
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memory/3068-13-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmpFilesize
9.9MB