Analysis
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max time kernel
147s -
max time network
151s -
platform
windows7_x64 -
resource
win7-20230220-en -
resource tags
arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system -
submitted
30-05-2023 14:54
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20230220-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
59821db4fc3efdd9d78185a16efa5917
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SHA1
9a53b49c3e42a83e6833c0da4107bae862b4d6b9
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SHA256
a5d114be9a4e5f601a6d855b25b7e206d60f55f9a605ad1c8ebafd964fa1ed70
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SHA512
d3d0f978a50edbe669b68ece5ba183b75bcfa701185370682227501daf643ee08fa22f7e540f00c604459f986b73e11601401c11ed48b8f50ed5fe848af4fd29
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SSDEEP
49152:0v/t62XlaSFNWPjljiFa2RoUYI+ZyP+vEVTHHB72eh2NT:0vV62XlaSFNWPjljiFXRoUYI+Zi
Malware Config
Extracted
quasar
1.4.1
Bob681
181.215.176.73:59955
4a19a6ac-9ac6-4cbd-ab2f-1e469ebe93aa
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encryption_key
01A024E271E79DC5F555EC503C0E2AB6090246F2
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install_name
repl.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
replstart
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subdirectory
repl
Signatures
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Quasar payload 4 IoCs
Processes:
resource yara_rule behavioral1/memory/1104-54-0x0000000000C70000-0x0000000000F8A000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\repl\repl.exe family_quasar C:\Users\Admin\AppData\Roaming\repl\repl.exe family_quasar behavioral1/memory/1160-61-0x00000000009B0000-0x0000000000CCA000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
Processes:
repl.exepid process 1160 repl.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 1216 schtasks.exe 1920 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exerepl.exedescription pid process Token: SeDebugPrivilege 1104 Client-built.exe Token: SeDebugPrivilege 1160 repl.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
repl.exepid process 1160 repl.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
repl.exepid process 1160 repl.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
Client-built.exerepl.exedescription pid process target process PID 1104 wrote to memory of 1216 1104 Client-built.exe schtasks.exe PID 1104 wrote to memory of 1216 1104 Client-built.exe schtasks.exe PID 1104 wrote to memory of 1216 1104 Client-built.exe schtasks.exe PID 1104 wrote to memory of 1160 1104 Client-built.exe repl.exe PID 1104 wrote to memory of 1160 1104 Client-built.exe repl.exe PID 1104 wrote to memory of 1160 1104 Client-built.exe repl.exe PID 1160 wrote to memory of 1920 1160 repl.exe schtasks.exe PID 1160 wrote to memory of 1920 1160 repl.exe schtasks.exe PID 1160 wrote to memory of 1920 1160 repl.exe schtasks.exe -
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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exe"schtasks" /create /tn "replstart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\repl\repl.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Roaming\repl\repl.exe"C:\Users\Admin\AppData\Roaming\repl\repl.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exe"schtasks" /create /tn "replstart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\repl\repl.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Roaming\repl\repl.exeFilesize
3.1MB
MD559821db4fc3efdd9d78185a16efa5917
SHA19a53b49c3e42a83e6833c0da4107bae862b4d6b9
SHA256a5d114be9a4e5f601a6d855b25b7e206d60f55f9a605ad1c8ebafd964fa1ed70
SHA512d3d0f978a50edbe669b68ece5ba183b75bcfa701185370682227501daf643ee08fa22f7e540f00c604459f986b73e11601401c11ed48b8f50ed5fe848af4fd29
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C:\Users\Admin\AppData\Roaming\repl\repl.exeFilesize
3.1MB
MD559821db4fc3efdd9d78185a16efa5917
SHA19a53b49c3e42a83e6833c0da4107bae862b4d6b9
SHA256a5d114be9a4e5f601a6d855b25b7e206d60f55f9a605ad1c8ebafd964fa1ed70
SHA512d3d0f978a50edbe669b68ece5ba183b75bcfa701185370682227501daf643ee08fa22f7e540f00c604459f986b73e11601401c11ed48b8f50ed5fe848af4fd29
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memory/1104-54-0x0000000000C70000-0x0000000000F8A000-memory.dmpFilesize
3.1MB
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memory/1104-55-0x000000001B360000-0x000000001B3E0000-memory.dmpFilesize
512KB
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memory/1160-61-0x00000000009B0000-0x0000000000CCA000-memory.dmpFilesize
3.1MB
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memory/1160-62-0x000000001B490000-0x000000001B510000-memory.dmpFilesize
512KB