Analysis
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max time kernel
1798s -
max time network
1591s -
platform
windows10-2004_x64 -
resource
win10v2004-20231020-en -
resource tags
arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system -
submitted
27-11-2023 09:45
Behavioral task
behavioral1
Sample
3.exe
Resource
win7-20231023-en
General
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Target
3.exe
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Size
3.1MB
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MD5
fc4aeba6edc65fcf2bd47bf61c66ca4c
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SHA1
532f44164ccec22376d6e29f58f44934dfeadb5c
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SHA256
0a6e5f7ca85a281115b343cb8be21e969ab42efb02ff8cc138c7800291839c8d
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SHA512
3c72078fdacbe38418b4a8ffc34e895a69e8c7df5175f0207b56c5ae4f043b3571e05e6e38e5100b21af52e05e80dfee27ff1a44a687d8ae380efda7b11f43d1
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SSDEEP
49152:ev1t62XlaSFNWPjljiFa2RoUYIjjjYmzYaoGd4THHB72eh2NT:evH62XlaSFNWPjljiFXRoUYIjjj3
Malware Config
Extracted
quasar
1.4.1
Office04
127.0.0.7:5555
6f01cc79-8527-4436-a34a-473fcf92b46f
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encryption_key
D52EA8296126E8DD7D221BC02E2826F1CAA96C78
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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
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 3 IoCs
resource yara_rule behavioral2/memory/4904-0-0x0000000000260000-0x0000000000584000-memory.dmp family_quasar behavioral2/files/0x000a000000022d59-6.dat family_quasar behavioral2/files/0x000a000000022d59-8.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2004 Client.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.
pid Process 656 schtasks.exe 2168 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
description pid Process Token: SeDebugPrivilege 4904 3.exe Token: SeDebugPrivilege 2004 Client.exe Token: SeManageVolumePrivilege 4196 svchost.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 2004 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 2004 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 4904 wrote to memory of 656 4904 3.exe 88 PID 4904 wrote to memory of 656 4904 3.exe 88 PID 4904 wrote to memory of 2004 4904 3.exe 89 PID 4904 wrote to memory of 2004 4904 3.exe 89 PID 2004 wrote to memory of 2168 2004 Client.exe 90 PID 2004 wrote to memory of 2168 2004 Client.exe 90 -
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\3.exe"C:\Users\Admin\AppData\Local\Temp\3.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4904 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:656
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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 FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:2004 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:2168
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C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe1⤵PID:924
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k UnistackSvcGroup1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4196
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
16KB
MD5b872b8d2943938922c555034663a5fc4
SHA1f654a891d50f5bf33ee6f7559e4ed2d2a7b5793c
SHA2560ae2995984ea2d72702a43e7abb089a44348fbbb1ad6a116c76ea6c9e1dc57f1
SHA512d6c3ce58e8aee10eac2005ed558d8209ca64e623805eb5ab7d6cfb7ec4b9191094c3c95a31bbe90d41ce3ee06fc06faa209dc5e6c9507ee44d448c56171aa749
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Filesize
3.1MB
MD5fc4aeba6edc65fcf2bd47bf61c66ca4c
SHA1532f44164ccec22376d6e29f58f44934dfeadb5c
SHA2560a6e5f7ca85a281115b343cb8be21e969ab42efb02ff8cc138c7800291839c8d
SHA5123c72078fdacbe38418b4a8ffc34e895a69e8c7df5175f0207b56c5ae4f043b3571e05e6e38e5100b21af52e05e80dfee27ff1a44a687d8ae380efda7b11f43d1
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Filesize
3.1MB
MD5fc4aeba6edc65fcf2bd47bf61c66ca4c
SHA1532f44164ccec22376d6e29f58f44934dfeadb5c
SHA2560a6e5f7ca85a281115b343cb8be21e969ab42efb02ff8cc138c7800291839c8d
SHA5123c72078fdacbe38418b4a8ffc34e895a69e8c7df5175f0207b56c5ae4f043b3571e05e6e38e5100b21af52e05e80dfee27ff1a44a687d8ae380efda7b11f43d1