Analysis
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max time kernel
52s -
max time network
114s -
platform
windows7_x64 -
resource
win7-20221111-en -
resource tags
arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system -
submitted
13/01/2023, 15:00
Behavioral task
behavioral1
Sample
Vietcombank_Ban Sao Thanh Toan_Pdf.exe
Resource
win7-20221111-en
Behavioral task
behavioral2
Sample
Vietcombank_Ban Sao Thanh Toan_Pdf.exe
Resource
win10v2004-20221111-en
General
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Target
Vietcombank_Ban Sao Thanh Toan_Pdf.exe
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Size
23KB
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MD5
357dc7fc40a74f7db969a2bd89188d6d
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SHA1
4afed0569b36c95f96bac367232cae88eb201e64
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SHA256
bc6b7187bcc579a4fd0e7ffc54bb1a5fb9fa47a3d781bce55a8c4d9ba4df0139
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SHA512
da23f8e01dfd78874bd274ae7cca8593ca7be0c12d3de0061630e6c737cbc87433451536ed992491568221b82548eff353bc19c7e3e6383a49d3e6a0ae261c8a
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SSDEEP
96:P99U6k5sBsdf2XLGMRE7ng2deOFVkAwGuTFKfEPfPNAgARricsGb7kvrBzNt:Pb6KLGMWkOMAluTFCEvNesG+D
Malware Config
Extracted
purecrypter
http://savory.com.bd/sav/Ezxucmj.bmp
Signatures
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PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
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Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
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Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
description ioc Process Key opened \REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Vietcombank_Ban Sao Thanh Toan_Pdf.exe Key opened \REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Vietcombank_Ban Sao Thanh Toan_Pdf.exe Key opened \REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Vietcombank_Ban Sao Thanh Toan_Pdf.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Windows\CurrentVersion\Run\vlc = "\"C:\\Users\\Admin\\AppData\\Roaming\\vlc\\vlc.exe\"" Vietcombank_Ban Sao Thanh Toan_Pdf.exe -
Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 7 api.ipify.org 8 api.ipify.org -
Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 960 set thread context of 1112 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 32 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Suspicious behavior: EnumeratesProcesses 5 IoCs
pid Process 568 powershell.exe 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
description pid Process Token: SeDebugPrivilege 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe Token: SeDebugPrivilege 568 powershell.exe Token: SeDebugPrivilege 1112 Vietcombank_Ban Sao Thanh Toan_Pdf.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 1112 Vietcombank_Ban Sao Thanh Toan_Pdf.exe -
Suspicious use of WriteProcessMemory 21 IoCs
description pid Process procid_target PID 960 wrote to memory of 568 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 28 PID 960 wrote to memory of 568 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 28 PID 960 wrote to memory of 568 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 28 PID 960 wrote to memory of 568 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 28 PID 960 wrote to memory of 1564 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 30 PID 960 wrote to memory of 1564 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 30 PID 960 wrote to memory of 1564 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 30 PID 960 wrote to memory of 1564 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 30 PID 960 wrote to memory of 1272 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 31 PID 960 wrote to memory of 1272 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 31 PID 960 wrote to memory of 1272 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 31 PID 960 wrote to memory of 1272 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 31 PID 960 wrote to memory of 1112 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 32 PID 960 wrote to memory of 1112 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 32 PID 960 wrote to memory of 1112 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 32 PID 960 wrote to memory of 1112 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 32 PID 960 wrote to memory of 1112 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 32 PID 960 wrote to memory of 1112 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 32 PID 960 wrote to memory of 1112 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 32 PID 960 wrote to memory of 1112 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 32 PID 960 wrote to memory of 1112 960 Vietcombank_Ban Sao Thanh Toan_Pdf.exe 32 -
outlook_office_path 1 IoCs
description ioc Process Key opened \REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Vietcombank_Ban Sao Thanh Toan_Pdf.exe -
outlook_win_path 1 IoCs
description ioc Process Key opened \REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Vietcombank_Ban Sao Thanh Toan_Pdf.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:960 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:568
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C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"2⤵PID:1564
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C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"2⤵PID:1272
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C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"2⤵
- Accesses Microsoft Outlook profiles
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- outlook_office_path
- outlook_win_path
PID:1112
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