Analysis
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max time kernel
146s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
14-12-2024 12:31
Behavioral task
behavioral1
Sample
b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe
Resource
win7-20241010-en
General
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Target
b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe
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Size
3.1MB
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MD5
77de6e8143094a619804ebf2d59eb094
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SHA1
b87fc79d0825d979314c392781b0211087e78ca2
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SHA256
b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8
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SHA512
fa6dcd1d8b78548e12d22098a6b9107a744b9b85dd8276c18faf601f30ada97e7f023c6e376dc929c715c308a57b1105199acdd69697a0e6930bccd7afc2a6f9
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SSDEEP
49152:zvylL26AaNeWgPhlmVqvMQ7XSKokCP1JSLoGdatCTHHB72eh2NT:zvqL26AaNeWgPhlmVqkQ7XSKokCs
Malware Config
Extracted
quasar
1.4.1
Test
193.161.193.99:35184
67.205.154.243:35184
9cabbafb-503b-49f1-ab22-adc756455c10
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encryption_key
8B93C77AC1C58EA80A3327E9FD26246A79EF3B8E
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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
MS Build Tools
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subdirectory
Microsoft-Build-Tools
Signatures
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Quasar family
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Quasar payload 2 IoCs
resource yara_rule behavioral2/memory/5072-1-0x0000000000730000-0x0000000000A54000-memory.dmp family_quasar behavioral2/files/0x0007000000023cc4-4.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 4392 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.
pid Process 1884 schtasks.exe 212 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 5072 b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe Token: SeDebugPrivilege 4392 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 4392 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 5072 wrote to memory of 1884 5072 b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe 82 PID 5072 wrote to memory of 1884 5072 b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe 82 PID 5072 wrote to memory of 4392 5072 b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe 84 PID 5072 wrote to memory of 4392 5072 b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe 84 PID 4392 wrote to memory of 212 4392 Client.exe 85 PID 4392 wrote to memory of 212 4392 Client.exe 85 -
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\b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe"C:\Users\Admin\AppData\Local\Temp\b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5072 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "MS Build Tools" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:1884
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C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe"C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4392 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "MS Build Tools" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:212
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD577de6e8143094a619804ebf2d59eb094
SHA1b87fc79d0825d979314c392781b0211087e78ca2
SHA256b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8
SHA512fa6dcd1d8b78548e12d22098a6b9107a744b9b85dd8276c18faf601f30ada97e7f023c6e376dc929c715c308a57b1105199acdd69697a0e6930bccd7afc2a6f9