Analysis
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max time kernel
150s -
max time network
154s -
platform
windows10-2004_x64 -
resource
win10v2004-20230703-en -
resource tags
arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system -
submitted
03/08/2023, 07:04
Static task
static1
Behavioral task
behavioral1
Sample
Refbkefruvt.exe
Resource
win7-20230712-en
Behavioral task
behavioral2
Sample
Refbkefruvt.exe
Resource
win10v2004-20230703-en
General
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Target
Refbkefruvt.exe
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Size
587KB
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MD5
a58ba28556b22b42763f7e250fb0a4ee
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SHA1
1736c40a3405568ea7eb99626fc6787225081eac
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SHA256
0ebd3bc3035a85c16d9856235d470598e247755fb4b3744c32ac6bab6c4d311f
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SHA512
e2061c4c2ab471f4f6d7c9af420cb821f28b640f3c8b0a20fa7d994e36c0a1996922f84cc471e26518eeba3bbe059cb861371afb5c612327be9a9706f7f0abf0
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SSDEEP
6144:hWsTS0AV13ha4LtgdA8ICUNV9xIm683GcS+/ccP+zwrC3vGIETPm3zBzPH:k3ltga2UNKsFSJcPu
Malware Config
Extracted
snakekeylogger
https://api.telegram.org/bot6131487156:AAFzpoRUv23HSoE57FgrwPQiVuiha1F8Pcs/sendMessage?chat_id=6373691592
Signatures
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Snake Keylogger
Keylogger and Infostealer first seen in November 2020.
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Snake Keylogger payload 2 IoCs
resource yara_rule behavioral2/memory/4928-1219-0x0000000140000000-0x0000000140022000-memory.dmp family_snakekeylogger behavioral2/memory/4928-1225-0x000001C69F210000-0x000001C69F220000-memory.dmp family_snakekeylogger -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3195054982-4292022746-1467505928-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\eeeee = "C:\\Users\\Admin\\AppData\\Roaming\\eeeee.exe" Refbkefruvt.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 38 checkip.dyndns.org -
Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 3252 set thread context of 4928 3252 Refbkefruvt.exe 94 -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 4928 MSBuild.exe 4928 MSBuild.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3252 Refbkefruvt.exe Token: SeDebugPrivilege 4928 MSBuild.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 3252 wrote to memory of 4928 3252 Refbkefruvt.exe 94 PID 3252 wrote to memory of 4928 3252 Refbkefruvt.exe 94 PID 3252 wrote to memory of 4928 3252 Refbkefruvt.exe 94 PID 3252 wrote to memory of 4928 3252 Refbkefruvt.exe 94 PID 3252 wrote to memory of 4928 3252 Refbkefruvt.exe 94 PID 3252 wrote to memory of 4928 3252 Refbkefruvt.exe 94
Processes
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C:\Users\Admin\AppData\Local\Temp\Refbkefruvt.exe"C:\Users\Admin\AppData\Local\Temp\Refbkefruvt.exe"1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3252 -
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exeC:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4928
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