Analysis
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max time kernel
149s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20240611-en -
resource tags
arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system -
submitted
29-06-2024 01:56
Behavioral task
behavioral1
Sample
f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exe
Resource
win7-20240611-en
General
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Target
f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.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 2 IoCs
Processes:
resource yara_rule C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe family_quasar behavioral2/memory/5032-5-0x00000000008E0000-0x0000000000C04000-memory.dmp family_quasar -
Detects Windows executables referencing non-Windows User-Agents 2 IoCs
Processes:
resource yara_rule C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA behavioral2/memory/5032-5-0x00000000008E0000-0x0000000000C04000-memory.dmp INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA -
Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs
Processes:
resource yara_rule C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe INDICATOR_SUSPICIOUS_Binary_References_Browsers behavioral2/memory/5032-5-0x00000000008E0000-0x0000000000C04000-memory.dmp INDICATOR_SUSPICIOUS_Binary_References_Browsers -
Detects executables containing common artifacts observed in infostealers 2 IoCs
Processes:
resource yara_rule C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe INDICATOR_SUSPICIOUS_GENInfoStealer behavioral2/memory/5032-5-0x00000000008E0000-0x0000000000C04000-memory.dmp INDICATOR_SUSPICIOUS_GENInfoStealer -
Drops startup file 1 IoCs
Processes:
f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exe -
Executes dropped EXE 2 IoCs
Processes:
sign.exeClient.exepid process 5032 sign.exe 2652 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 1488 schtasks.exe 1764 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
Processes:
f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exepid process 448 f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exe 448 f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
sign.exeClient.exedescription pid process Token: SeDebugPrivilege 5032 sign.exe Token: SeDebugPrivilege 2652 Client.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
Processes:
f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exepid process 448 f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exe 448 f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exesign.exeClient.exedescription pid process target process PID 448 wrote to memory of 5032 448 f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exe sign.exe PID 448 wrote to memory of 5032 448 f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exe sign.exe PID 5032 wrote to memory of 1488 5032 sign.exe schtasks.exe PID 5032 wrote to memory of 1488 5032 sign.exe schtasks.exe PID 5032 wrote to memory of 2652 5032 sign.exe Client.exe PID 5032 wrote to memory of 2652 5032 sign.exe Client.exe PID 2652 wrote to memory of 1764 2652 Client.exe schtasks.exe PID 2652 wrote to memory of 1764 2652 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\f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exe"C:\Users\Admin\AppData\Local\Temp\f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115.exe"1⤵
- Drops startup file
- Suspicious behavior: EnumeratesProcesses
- 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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C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exeFilesize
3.1MB
MD57498d554976744dfbd271ba755c6c192
SHA1ec733d01e776518e387d2f51d1a6559b81f03b1e
SHA25644089202623b9671051aa5bba5e72f81f68ce818c3054dde57726aaa6dcb9ff7
SHA512d4e987d0e6235001fac4ae3a634e8fe98c6830e26a6a6876fbc36262842688d3ec301cff75003d2af695cdfd357ac50919946695b7d5d3293ebcba97153e1030
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memory/2652-14-0x0000000002DB0000-0x0000000002E00000-memory.dmpFilesize
320KB
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memory/2652-15-0x000000001C020000-0x000000001C0D2000-memory.dmpFilesize
712KB
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memory/5032-4-0x00007FFA61A73000-0x00007FFA61A75000-memory.dmpFilesize
8KB
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memory/5032-5-0x00000000008E0000-0x0000000000C04000-memory.dmpFilesize
3.1MB
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memory/5032-6-0x00007FFA61A70000-0x00007FFA62531000-memory.dmpFilesize
10.8MB
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memory/5032-13-0x00007FFA61A70000-0x00007FFA62531000-memory.dmpFilesize
10.8MB