gurcu | c3439dd56bcf3921cdbfcbdff3f928d14ebd632b3411235657bf9f5452c1ab9d | Triage™

Resubmissions

10/04/2024, 02:41

240410-c6hmmsfd7z10

10/04/2024, 02:41

240410-c6g14scb4610

10/04/2024, 02:41

240410-c6gqcacb4510

10/04/2024, 02:41

240410-c6f4tacb4410

14/10/2023, 01:33

231014-bysbfahh6s10

Analysis

max time kernel
6s
max time network
251s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
10/04/2024, 02:41

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General

Target
x19a4f9f3d16fcc9779ba8ea79bf7.exe
Size 392KB
Sample240410-c6f4tacb44
SHA256 c3439dd56bcf3921cdbfcbdff3f928d14ebd632b3411235657bf9f5452c1ab9d
MD5 2299a17350433284e58bd0fcc10edf41
SHA1 d477f1cd55365db00ca77cc5459afabe1ffc80b3
SHA512 123d18cf17b4bb0f0b16414039c2381f77e9f12c96a109d5847c760e4d7fb64f6c592f8f185a4c0375aade6754afd0abd6a196936adac405290f157829ae25a1
SSDEEP 6144:5cJGLvLE5hu6Me646G0D1ecme1x9b31v4n:uUvLr6k9b5ecmed1v4
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

gurcu spyware stealer

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

Signatures

Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
stealer gurcu

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3045580317-3728985860-206385570-1000\Control Panel\International\Geo\Nation	x19a4f9f3d16fcc9779ba8ea79bf7.exe

Executes dropped EXE 1 IoCs

pid	Process
1580	x19a4f9f3d16fcc9779ba8ea79bf7.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

Scheduled Task/Job

pid	Process
1724	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

pid	Process
1924	PING.EXE

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3592	x19a4f9f3d16fcc9779ba8ea79bf7.exe
Token: SeDebugPrivilege	1580	x19a4f9f3d16fcc9779ba8ea79bf7.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3592 wrote to memory of 4492	3592	x19a4f9f3d16fcc9779ba8ea79bf7.exe	86
PID 3592 wrote to memory of 4492	3592	x19a4f9f3d16fcc9779ba8ea79bf7.exe	86
PID 4492 wrote to memory of 4572	4492	cmd.exe	88
PID 4492 wrote to memory of 4572	4492	cmd.exe	88
PID 4492 wrote to memory of 1924	4492	cmd.exe	89
PID 4492 wrote to memory of 1924	4492	cmd.exe	89
PID 4492 wrote to memory of 1724	4492	cmd.exe	92
PID 4492 wrote to memory of 1724	4492	cmd.exe	92
PID 4492 wrote to memory of 1580	4492	cmd.exe	93
PID 4492 wrote to memory of 1580	4492	cmd.exe	93

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe
"C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3592
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "x19a4f9f3d16fcc9779ba8ea79bf7" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4492
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:4572
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:1924
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "x19a4f9f3d16fcc9779ba8ea79bf7" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1724
- - C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
    "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1580

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Persistence

Scheduled Task/Job

Privilege Escalation

Scheduled Task/Job

Defense Evasion

Credential Access

Unsecured Credentials

Credentials In Files

Discovery

Query Registry

Remote System Discovery

System Information Discovery

Lateral Movement

Collection

Data from Local System

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

x19a4f9f3d16fcc9779ba8ea79bf7.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\x19a4f9f3d16fcc9779ba8ea79bf7.exe.log
Size 847B
SHA256 169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e
MD5 3308a84a40841fab7dfec198b3c31af7
SHA1 4e7ab6336c0538be5dd7da529c0265b3b6523083
SHA512 97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198
MD5 SHA1 SHA512

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x19a4f9f3d16fcc9779ba8ea79bf7.exe

Path C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
Size 392KB
SHA256 c3439dd56bcf3921cdbfcbdff3f928d14ebd632b3411235657bf9f5452c1ab9d
MD5 2299a17350433284e58bd0fcc10edf41
SHA1 d477f1cd55365db00ca77cc5459afabe1ffc80b3
SHA512 123d18cf17b4bb0f0b16414039c2381f77e9f12c96a109d5847c760e4d7fb64f6c592f8f185a4c0375aade6754afd0abd6a196936adac405290f157829ae25a1
SSDEEP 6144:5cJGLvLE5hu6Me646G0D1ecme1x9b31v4n:uUvLr6k9b5ecmed1v4
MD5 SHA1 SHA512 SSDEEP

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memory/1580-11-0x00007FF89BEB0000-0x00007FF89C971000-memory.dmp

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memory/1580-12-0x000001A829DB0000-0x000001A829DC0000-memory.dmp

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memory/3592-0-0x0000023FBB3C0000-0x0000023FBB428000-memory.dmp

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memory/3592-1-0x00007FF89D720000-0x00007FF89E1E1000-memory.dmp

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memory/3592-4-0x0000023FD59A0000-0x0000023FD59B0000-memory.dmp

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memory/3592-6-0x00007FF89D720000-0x00007FF89E1E1000-memory.dmp

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