Analysis
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max time kernel
144s -
max time network
151s -
platform
windows7_x64 -
resource
win7-20220812-en -
resource tags
arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system -
submitted
28/12/2022, 23:02
Behavioral task
behavioral1
Sample
Shut.exe
Resource
win7-20220812-en
General
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Target
Shut.exe
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Size
502KB
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MD5
225bee869cfc364982f132a8b9320f1e
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SHA1
3d13fdd4c3781a3fe0b279f5480b88150cdc1ada
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SHA256
fc6402f6df918d0307ea6e033afebf90fde69ca6b74dc6af4d97423d00518c45
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SHA512
e17a17f41d57dbf28fa775926e2085e19b5583c5399b2e5d36466c0d4ee70bf2eb3d3c2ae079995bcf1eee5e9c3aaa0c84fbf462dd0d8c6e5591ae2a1210a871
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SSDEEP
6144:RTEgdc0YrXAGbgiIN2RSB3d1dcKlh/z+055QBcEivb8F9ftEnq9YcTR3L:RTEgdfYbbg7d575Qys7E1cdL
Malware Config
Extracted
quasar
1.4.0
Office04
193.149.176.156:8080
e51896b4-9928-4edd-8f19-3d5855d3388f
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encryption_key
936C784DF6BFBCB86D89EDF1DA8425E6D70DCFBB
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install_name
explorer.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Windows Defender
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subdirectory
D3SD
Signatures
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Quasar payload 4 IoCs
resource yara_rule behavioral1/memory/1944-54-0x0000000000250000-0x00000000002D4000-memory.dmp family_quasar behavioral1/files/0x000a00000001313e-59.dat family_quasar behavioral1/files/0x000a00000001313e-58.dat family_quasar behavioral1/memory/1720-60-0x00000000009F0000-0x0000000000A74000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
pid Process 1720 explorer.exe -
Drops file in System32 directory 5 IoCs
description ioc Process File opened for modification C:\Windows\system32\D3SD\explorer.exe explorer.exe File opened for modification C:\Windows\system32\D3SD explorer.exe File created C:\Windows\system32\D3SD\explorer.exe Shut.exe File opened for modification C:\Windows\system32\D3SD\explorer.exe Shut.exe File opened for modification C:\Windows\system32\D3SD Shut.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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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 1676 schtasks.exe 944 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 1944 Shut.exe Token: SeDebugPrivilege 1720 explorer.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 1720 explorer.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 1720 explorer.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 1720 explorer.exe -
Suspicious use of WriteProcessMemory 9 IoCs
description pid Process procid_target PID 1944 wrote to memory of 1676 1944 Shut.exe 28 PID 1944 wrote to memory of 1676 1944 Shut.exe 28 PID 1944 wrote to memory of 1676 1944 Shut.exe 28 PID 1944 wrote to memory of 1720 1944 Shut.exe 29 PID 1944 wrote to memory of 1720 1944 Shut.exe 29 PID 1944 wrote to memory of 1720 1944 Shut.exe 29 PID 1720 wrote to memory of 944 1720 explorer.exe 30 PID 1720 wrote to memory of 944 1720 explorer.exe 30 PID 1720 wrote to memory of 944 1720 explorer.exe 30
Processes
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C:\Users\Admin\AppData\Local\Temp\Shut.exe"C:\Users\Admin\AppData\Local\Temp\Shut.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1944 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Shut.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:1676
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C:\Windows\system32\D3SD\explorer.exe"C:\Windows\system32\D3SD\explorer.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1720 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Windows\system32\D3SD\explorer.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:944
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
502KB
MD5225bee869cfc364982f132a8b9320f1e
SHA13d13fdd4c3781a3fe0b279f5480b88150cdc1ada
SHA256fc6402f6df918d0307ea6e033afebf90fde69ca6b74dc6af4d97423d00518c45
SHA512e17a17f41d57dbf28fa775926e2085e19b5583c5399b2e5d36466c0d4ee70bf2eb3d3c2ae079995bcf1eee5e9c3aaa0c84fbf462dd0d8c6e5591ae2a1210a871
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Filesize
502KB
MD5225bee869cfc364982f132a8b9320f1e
SHA13d13fdd4c3781a3fe0b279f5480b88150cdc1ada
SHA256fc6402f6df918d0307ea6e033afebf90fde69ca6b74dc6af4d97423d00518c45
SHA512e17a17f41d57dbf28fa775926e2085e19b5583c5399b2e5d36466c0d4ee70bf2eb3d3c2ae079995bcf1eee5e9c3aaa0c84fbf462dd0d8c6e5591ae2a1210a871