Analysis
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max time kernel
144s -
max time network
155s -
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, 03:20
Behavioral task
behavioral1
Sample
Client-abuilt.exe
Resource
win7-20240221-en
General
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Target
Client-abuilt.exe
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Size
3.3MB
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MD5
fe6bb1f615029c7e339444cbc41706bb
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SHA1
cabd13e4e04ef81687812f8680e55e048ee75bd7
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SHA256
b2ebc3a634719e1727dcae13f9a4f5df3d89b89718cfd0b2886a971a08b55e77
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SHA512
90b15572b73bb065f8cc38a2ca1dbe8ee73991c3693c49f96cda8652d89b010199f4f152b53ae5a7de1a3b13877d301f724ff454e9187950053f7735849e7e82
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SSDEEP
49152:3v+I22SsaNYfdPBldt698dBcjHQr0hrTavJSZoGdbTHHB72eh2NTDZqS:3vz22SsaNYfdPBldt6+dBcjHdTB
Malware Config
Extracted
quasar
1.4.1
Office01
198.7.62.204:4782
192.168.1.1:4782
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/4380-0-0x0000000000010000-0x0000000000358000-memory.dmp family_quasar behavioral2/files/0x0004000000022d20-6.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 4084 Client.exe -
Drops file in System32 directory 5 IoCs
description ioc Process File created C:\Windows\system32\SubDir\Client.exe Client-abuilt.exe File opened for modification C:\Windows\system32\SubDir\Client.exe Client-abuilt.exe File opened for modification C:\Windows\system32\SubDir Client-abuilt.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 1432 schtasks.exe 2940 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4380 Client-abuilt.exe Token: SeDebugPrivilege 4084 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 4084 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 4380 wrote to memory of 1432 4380 Client-abuilt.exe 96 PID 4380 wrote to memory of 1432 4380 Client-abuilt.exe 96 PID 4380 wrote to memory of 4084 4380 Client-abuilt.exe 98 PID 4380 wrote to memory of 4084 4380 Client-abuilt.exe 98 PID 4084 wrote to memory of 2940 4084 Client.exe 99 PID 4084 wrote to memory of 2940 4084 Client.exe 99 -
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-abuilt.exe"C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4380 -
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:1432
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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:4084 -
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:2940
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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=3696 --field-trial-handle=3192,i,2785050981002401924,4037047756083432660,262144 --variations-seed-version /prefetch:81⤵PID:2444
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.3MB
MD5fe6bb1f615029c7e339444cbc41706bb
SHA1cabd13e4e04ef81687812f8680e55e048ee75bd7
SHA256b2ebc3a634719e1727dcae13f9a4f5df3d89b89718cfd0b2886a971a08b55e77
SHA51290b15572b73bb065f8cc38a2ca1dbe8ee73991c3693c49f96cda8652d89b010199f4f152b53ae5a7de1a3b13877d301f724ff454e9187950053f7735849e7e82