Analysis
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max time kernel
325s -
max time network
329s -
platform
windows10-2004_x64 -
resource
win10v2004-20240802-en -
resource tags
arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system -
submitted
18/08/2024, 22:04
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
3.4MB
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MD5
bc04ef1699a3b490ff2703a0bb2dcca0
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SHA1
b3f70784fb7c7ef0a3cca81280ede2ffe2671e35
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SHA256
844f43264b78b25a6526ab5f9997cca8243f67d51400f2abd4fd3c777b5fb983
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SHA512
e3d11bd54f4409c3a846e6466063d5e29f8222b3c2a2291b19401632a7a3884ed6bde8327c664f2b43e6e67914fca1eae4805730adbfd37706ac4d7e0a28a2e1
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SSDEEP
49152:xei8dGFjxJFp/DGoye3Z4LVYcl9v6igI2VSG3THHB72eh2NTfXDW:xeCFjxJTbGor3Z4LVY9r+JT
Malware Config
Extracted
quasar
1.4.1
SKIDS
147.185.221.22:10340
9b51d4f5-bfe4-4a06-ba47-dcfbf9fe8529
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encryption_key
9E968F05BD874BA1BE086FD1774A027473823F49
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install_name
Windows Host Process.exe
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log_directory
Windows-Logs
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reconnect_delay
3000
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startup_key
Windows Host Process
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subdirectory
Windows
Signatures
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Quasar payload 2 IoCs
resource yara_rule behavioral2/memory/4760-1-0x0000000000770000-0x0000000000AD0000-memory.dmp family_quasar behavioral2/files/0x00070000000234b3-7.dat family_quasar -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation Windows Host Process.exe -
Executes dropped EXE 1 IoCs
pid Process 1788 Windows Host Process.exe -
Drops file in System32 directory 5 IoCs
description ioc Process File created C:\Windows\system32\Windows\Windows Host Process.exe Client-built.exe File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe Client-built.exe File opened for modification C:\Windows\system32\Windows Client-built.exe File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe Windows Host Process.exe File opened for modification C:\Windows\system32\Windows Windows Host Process.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs
Adversaries may check for Internet connectivity on compromised systems.
pid Process 4260 PING.EXE -
Runs ping.exe 1 TTPs 1 IoCs
pid Process 4260 PING.EXE -
Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 2952 schtasks.exe 2808 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4760 Client-built.exe Token: SeDebugPrivilege 1788 Windows Host Process.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 1788 Windows Host Process.exe -
Suspicious use of WriteProcessMemory 14 IoCs
description pid Process procid_target PID 4760 wrote to memory of 2952 4760 Client-built.exe 86 PID 4760 wrote to memory of 2952 4760 Client-built.exe 86 PID 4760 wrote to memory of 1788 4760 Client-built.exe 88 PID 4760 wrote to memory of 1788 4760 Client-built.exe 88 PID 1788 wrote to memory of 2808 1788 Windows Host Process.exe 90 PID 1788 wrote to memory of 2808 1788 Windows Host Process.exe 90 PID 1788 wrote to memory of 4856 1788 Windows Host Process.exe 103 PID 1788 wrote to memory of 4856 1788 Windows Host Process.exe 103 PID 1788 wrote to memory of 4168 1788 Windows Host Process.exe 105 PID 1788 wrote to memory of 4168 1788 Windows Host Process.exe 105 PID 4168 wrote to memory of 372 4168 cmd.exe 107 PID 4168 wrote to memory of 372 4168 cmd.exe 107 PID 4168 wrote to memory of 4260 4168 cmd.exe 108 PID 4168 wrote to memory of 4260 4168 cmd.exe 108 -
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:4760 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:2952
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C:\Windows\system32\Windows\Windows Host Process.exe"C:\Windows\system32\Windows\Windows Host Process.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1788 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:2808
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /delete /tn "Windows Host Process" /f3⤵PID:4856
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\lnCpXrcf0oWv.bat" "3⤵
- Suspicious use of WriteProcessMemory
PID:4168 -
C:\Windows\system32\chcp.comchcp 650014⤵PID:372
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C:\Windows\system32\PING.EXEping -n 10 localhost4⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:4260
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
215B
MD5a004cb3b4e56b606847a9e45983566a0
SHA13507e1a341551c4099e1b795bd4e2d4086676760
SHA25641954e985436118cc23fa2466ee4f997d3d84dad48691e5646b674f6fe1050c4
SHA5123e45874dddbadac74606402dd3083cf58c2e654d7ffed9192ff9b0452b92cf35f6bf70a4d16f659a0bc3b4c7d7d3247a7a2d05bb992a0b0b4eed6d7c840a8257
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Filesize
3.4MB
MD5bc04ef1699a3b490ff2703a0bb2dcca0
SHA1b3f70784fb7c7ef0a3cca81280ede2ffe2671e35
SHA256844f43264b78b25a6526ab5f9997cca8243f67d51400f2abd4fd3c777b5fb983
SHA512e3d11bd54f4409c3a846e6466063d5e29f8222b3c2a2291b19401632a7a3884ed6bde8327c664f2b43e6e67914fca1eae4805730adbfd37706ac4d7e0a28a2e1