Analysis
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max time kernel
94s -
max time network
141s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
13-12-2024 10:00
Behavioral task
behavioral1
Sample
Loader.exe
Resource
win7-20240903-en
General
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Target
Loader.exe
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Size
3.1MB
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MD5
e9a138d8c5ab2cccc8bf9976f66d30c8
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SHA1
e996894168f0d4e852162d1290250dfa986310f8
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SHA256
e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3
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SHA512
5982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc
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SSDEEP
49152:fvrI22SsaNYfdPBldt698dBcjHCWvXE/sGkCqILo+dPVTHHB72eh2NT:fvU22SsaNYfdPBldt6+dBcjHCWvTm
Malware Config
Extracted
quasar
1.4.1
Office04
Dystopian-62863.portmap.host:62863
e1de8f9b-5a7a-4798-a6fb-c03591ef3442
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encryption_key
8C1BB32BFD240218BA0CB04D65341FB1FDE1E001
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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
SubStart
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subdirectory
SubDir
Signatures
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Quasar family
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Quasar payload 2 IoCs
resource yara_rule behavioral2/memory/2920-1-0x0000000000CB0000-0x0000000000FD4000-memory.dmp family_quasar behavioral2/files/0x000a000000023b66-6.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 3012 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 4884 schtasks.exe 440 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2920 Loader.exe Token: SeDebugPrivilege 3012 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 3012 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 2920 wrote to memory of 4884 2920 Loader.exe 83 PID 2920 wrote to memory of 4884 2920 Loader.exe 83 PID 2920 wrote to memory of 3012 2920 Loader.exe 85 PID 2920 wrote to memory of 3012 2920 Loader.exe 85 PID 3012 wrote to memory of 440 3012 Client.exe 86 PID 3012 wrote to memory of 440 3012 Client.exe 86 -
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\Loader.exe"C:\Users\Admin\AppData\Local\Temp\Loader.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2920 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:4884
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3012 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:440
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5e9a138d8c5ab2cccc8bf9976f66d30c8
SHA1e996894168f0d4e852162d1290250dfa986310f8
SHA256e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3
SHA5125982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc