Analysis
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max time kernel
142s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20231127-en -
resource tags
arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-x64system -
submitted
03-12-2023 10:41
Static task
static1
Behavioral task
behavioral1
Sample
425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe
Resource
win7-20231020-en
General
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Target
425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe
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Size
3.2MB
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MD5
58abd80cc431895f2c2126f714ca3c8c
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SHA1
9338c3bbe9e6dd3658848c03a5d3bcf02dfbe965
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SHA256
425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff
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SHA512
fcd8197173da2c475451f500cbea32b446d872a8553ebd76dae4ac3873ed8da149e8036cad65968f10d6719992e442e0ddfb458ce250c41521668d5117a14ec4
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SSDEEP
49152:S9GUKQbhUbLP/WdzmmVoNyQNKXVTHUt0ONKgDGsbolFjeTXbjuOvtXcUwowyr4T5:yUbLPudCfUj0t0ON/GUW6lJ3HdjX0
Malware Config
Extracted
quasar
1.4.1
Office04
y20.ddns.net:5552
081f9344-bbf0-4c0d-832c-1597fc2c5291
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encryption_key
51E85A39CEAF3ACB23D073483E360B1A632697B4
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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 1 IoCs
resource yara_rule behavioral2/memory/4840-10-0x0000000000400000-0x0000000000724000-memory.dmp family_quasar -
Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 1376 set thread context of 4840 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 94 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 4420 powershell.exe 4420 powershell.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
description pid Process Token: SeDebugPrivilege 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe Token: SeDebugPrivilege 4420 powershell.exe Token: SeDebugPrivilege 4840 RegAsm.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 4840 RegAsm.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 4840 RegAsm.exe -
Suspicious use of WriteProcessMemory 17 IoCs
description pid Process procid_target PID 1376 wrote to memory of 4420 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 91 PID 1376 wrote to memory of 4420 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 91 PID 1376 wrote to memory of 4420 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 91 PID 1376 wrote to memory of 2256 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 92 PID 1376 wrote to memory of 2256 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 92 PID 1376 wrote to memory of 2256 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 92 PID 1376 wrote to memory of 4816 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 93 PID 1376 wrote to memory of 4816 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 93 PID 1376 wrote to memory of 4816 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 93 PID 1376 wrote to memory of 4840 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 94 PID 1376 wrote to memory of 4840 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 94 PID 1376 wrote to memory of 4840 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 94 PID 1376 wrote to memory of 4840 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 94 PID 1376 wrote to memory of 4840 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 94 PID 1376 wrote to memory of 4840 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 94 PID 1376 wrote to memory of 4840 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 94 PID 1376 wrote to memory of 4840 1376 425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe 94
Processes
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C:\Users\Admin\AppData\Local\Temp\425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe"C:\Users\Admin\AppData\Local\Temp\425e3e4f280f19e1de7ced375ab0b31dbd2ffe49ed2684ecb140918d662d58ff.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1376 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"powershell.exe" Remove -ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name '';New-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name '' -Value '"C:\Users\Admin\AppData\Roaming\.exe"' -PropertyType 'String'2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4420
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe#cmd2⤵PID:2256
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe#cmd2⤵PID:4816
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe#cmd2⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:4840
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82