Analysis
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max time kernel
149s -
max time network
157s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
30/03/2024, 03:15
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240221-en
General
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Target
Client-built.exe
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Size
3.3MB
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MD5
eff096752ef1895d626f570a154c38a2
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SHA1
ae2c737e15d12d830220bae198b72717422d70d4
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SHA256
46297c4c0a1e8dcbffcc89326acc44e75720a62569242a804be88ea915fe4c8e
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SHA512
1c0cba459290f89874adab22697c62d9ebe15f41c68b2efa0d004a9e12b1cd4676480e35a04a3dbe9e4cdec59cbc7a2f1e7b5b30da856bf16052c8f958c8a52d
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SSDEEP
49152:rvBt62XlaSFNWPjljiFa2RoUYInlDkE2Hqk/+FWoGd++THHB72eh2NTfZqS:rvr62XlaSFNWPjljiFXRoUYInlDLEO
Malware Config
Extracted
quasar
1.4.1
Office01
198.7.62.204:4782
02b9c972-8b55-4d55-b7c4-09a1f00ff400
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encryption_key
5BF0703F288C43118835CAF4D1A6879C29016FB3
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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
Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
resource yara_rule behavioral2/memory/5076-0-0x0000000000820000-0x0000000000B68000-memory.dmp family_quasar behavioral2/files/0x00020000000227ea-6.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2280 Client.exe -
Drops file in System32 directory 5 IoCs
description ioc Process File created C:\Windows\system32\SubDir\Client.exe Client-built.exe File opened for modification C:\Windows\system32\SubDir\Client.exe Client-built.exe File opened for modification C:\Windows\system32\SubDir Client-built.exe File opened for modification C:\Windows\system32\SubDir\Client.exe Client.exe File opened for modification C:\Windows\system32\SubDir Client.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 4288 schtasks.exe 2260 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 5076 Client-built.exe Token: SeDebugPrivilege 2280 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2280 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 5076 wrote to memory of 4288 5076 Client-built.exe 95 PID 5076 wrote to memory of 4288 5076 Client-built.exe 95 PID 5076 wrote to memory of 2280 5076 Client-built.exe 97 PID 5076 wrote to memory of 2280 5076 Client-built.exe 97 PID 2280 wrote to memory of 2260 2280 Client.exe 98 PID 2280 wrote to memory of 2260 2280 Client.exe 98 -
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:5076 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:4288
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C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2280 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:2260
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3976 --field-trial-handle=2900,i,14549994492153927475,12895178890800740987,262144 --variations-seed-version /prefetch:81⤵PID:500
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.3MB
MD5eff096752ef1895d626f570a154c38a2
SHA1ae2c737e15d12d830220bae198b72717422d70d4
SHA25646297c4c0a1e8dcbffcc89326acc44e75720a62569242a804be88ea915fe4c8e
SHA5121c0cba459290f89874adab22697c62d9ebe15f41c68b2efa0d004a9e12b1cd4676480e35a04a3dbe9e4cdec59cbc7a2f1e7b5b30da856bf16052c8f958c8a52d