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Analysis
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max time kernel
91s -
max time network
176s -
platform
windows10-2004_x64 -
resource
win10v2004-20220812-en -
resource tags
arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system -
submitted
19/10/2022, 06:10
Static task
static1
Behavioral task
behavioral1
Sample
Withdrawal Authorization Letter.exe
Resource
win7-20220812-en
Behavioral task
behavioral2
Sample
Withdrawal Authorization Letter.exe
Resource
win10v2004-20220812-en
General
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Target
Withdrawal Authorization Letter.exe
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Size
882KB
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MD5
ab51fcab2443142fb70bb50872407815
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SHA1
c50331ac38b78963d45230c57927c18be34638e9
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SHA256
1f9a0cce25f1860e53b471745a001b8d868ce4d96c3d5365c6c3d39c8b7ceb04
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SHA512
2d7f8c53add06e86528d12899565ee0c848f20903c9092b2bff1e3a4c842343fd82c66801d43e90bf0e111b9465bd59bffe5f8619daf989631954f92b3c64756
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SSDEEP
12288:i6WTGfEuEKW/CyXfwA/7k35yVHLnVheEEcIc/aZLBNcKii/ARh:eZKwCkfL/AGqHlciugg
Malware Config
Extracted
snakekeylogger
Protocol: smtp- Host:
us2.smtp.mailhostbox.com - Port:
587 - Username:
[email protected] - Password:
qlRYaFn8 - Email To:
[email protected]
Signatures
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Snake Keylogger
Keylogger and Infostealer first seen in November 2020.
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Snake Keylogger payload 1 IoCs
resource yara_rule behavioral2/memory/3528-139-0x0000000000400000-0x0000000000426000-memory.dmp family_snakekeylogger -
Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
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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-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Withdrawal Authorization Letter.exe Key opened \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Withdrawal Authorization Letter.exe Key opened \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Withdrawal Authorization Letter.exe -
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 34 checkip.dyndns.org -
Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 1244 set thread context of 3528 1244 Withdrawal Authorization Letter.exe 90 -
Suspicious behavior: EnumeratesProcesses 1 IoCs
pid Process 3528 Withdrawal Authorization Letter.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 3528 Withdrawal Authorization Letter.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 1244 wrote to memory of 3528 1244 Withdrawal Authorization Letter.exe 90 PID 1244 wrote to memory of 3528 1244 Withdrawal Authorization Letter.exe 90 PID 1244 wrote to memory of 3528 1244 Withdrawal Authorization Letter.exe 90 PID 1244 wrote to memory of 3528 1244 Withdrawal Authorization Letter.exe 90 PID 1244 wrote to memory of 3528 1244 Withdrawal Authorization Letter.exe 90 PID 1244 wrote to memory of 3528 1244 Withdrawal Authorization Letter.exe 90 PID 1244 wrote to memory of 3528 1244 Withdrawal Authorization Letter.exe 90 PID 1244 wrote to memory of 3528 1244 Withdrawal Authorization Letter.exe 90 -
outlook_office_path 1 IoCs
description ioc Process Key opened \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Withdrawal Authorization Letter.exe -
outlook_win_path 1 IoCs
description ioc Process Key opened \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Withdrawal Authorization Letter.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Withdrawal Authorization Letter.exe"C:\Users\Admin\AppData\Local\Temp\Withdrawal Authorization Letter.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1244 -
C:\Users\Admin\AppData\Local\Temp\Withdrawal Authorization Letter.exe"C:\Users\Admin\AppData\Local\Temp\Withdrawal Authorization Letter.exe"2⤵
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
PID:3528
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Withdrawal Authorization Letter.exe.log
Filesize1KB
MD5e08f822522c617a40840c62e4b0fb45e
SHA1ae516dca4da5234be6676d3f234c19ec55725be7
SHA256bd9d5e9f7fe6fcff17d873555d4077d15f7d6cdda1183e7f7d278b735ffe1fd7
SHA512894a7fb7bbc18ac6ba13378f58a7db80ad00d6080be9a66b01cae8e23e41d9d2d4cd53c1e20669356b73590c8a3ebfda4bdda3258f81240db56c4a81b7313fe4