Analysis
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max time kernel
147s -
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
15-12-2024 18:00
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240903-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
2e3c730553c130f030cec92a781f2633
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SHA1
ae8a5a63a1a711b38d7dcfe3e91415fb42e058c4
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SHA256
f388ffe206b5de775298020541f201a9b055c3aad74cac27c33d392408cf12a0
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SHA512
c0784215cd1067051b47fe3f86e6059a410607a1cc9623377b887564220bf9046ec182705534521d9a30b6fc00e2e480a0e2a77457c7ec5098db01bf5e0d8327
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SSDEEP
49152:Cv6Y52fyaSZOrPWluWBuGG5g5hJZRJ69bR3LoGdW4THHB72eh2NT:CvP52fyaSZOrPWluWBDG5g5hJZRJ6P
Malware Config
Extracted
quasar
1.4.1
Office04
999:999
5a13e01b-5094-4ae8-9e4e-7b96132114ba
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encryption_key
C98F5FD72C77D3C38A5C7ECBED91435EDD8177FE
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install_name
Client.exe
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log_directory
key
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reconnect_delay
3000
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startup_key
cloud
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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/1628-1-0x0000000000860000-0x0000000000B84000-memory.dmp family_quasar behavioral2/files/0x000a000000023b7b-5.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 3284 Client.exe -
Drops file in System32 directory 4 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 -
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 4748 schtasks.exe 4420 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 1628 Client-built.exe Token: SeDebugPrivilege 3284 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 3284 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 1628 wrote to memory of 4748 1628 Client-built.exe 85 PID 1628 wrote to memory of 4748 1628 Client-built.exe 85 PID 1628 wrote to memory of 3284 1628 Client-built.exe 87 PID 1628 wrote to memory of 3284 1628 Client-built.exe 87 PID 3284 wrote to memory of 4420 3284 Client.exe 88 PID 3284 wrote to memory of 4420 3284 Client.exe 88 -
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:1628 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "cloud" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:4748
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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:3284 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "cloud" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:4420
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD52e3c730553c130f030cec92a781f2633
SHA1ae8a5a63a1a711b38d7dcfe3e91415fb42e058c4
SHA256f388ffe206b5de775298020541f201a9b055c3aad74cac27c33d392408cf12a0
SHA512c0784215cd1067051b47fe3f86e6059a410607a1cc9623377b887564220bf9046ec182705534521d9a30b6fc00e2e480a0e2a77457c7ec5098db01bf5e0d8327