gurcu | b63c575580d34f066ab3bcdae51289474a606497ff68cceabbc856710f99037d

Analysis

max time kernel
53s
max time network
74s
platform
windows10-1703_x64
resource
win10-20230220-en
resource tags

arch:x64arch:x86image:win10-20230220-enlocale:en-usos:windows10-1703-x64system
submitted
24-05-2023 12:46

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

buildlogs.exe
Size

500KB
MD5

f0bb0d68532e191a83e9ec3d3e03a0b8
SHA1

c7236c51ceaf92dec1876b139a0f07c9fba5712d
SHA256

b63c575580d34f066ab3bcdae51289474a606497ff68cceabbc856710f99037d
SHA512

0f110dc94579b96e1b9e8b3d6509106a3fddeee4fda1b169962a75f369cd9481c548a55ece62a44f169c46e16a7d7185fa7a1c4ab17fb57fffec1b91852dce12
SSDEEP

12288:jzWhSlcaq3/5/ISXd897Gm1MHx7vjHWzx:jChSa3/5wSXi7Gm1G7vLWN

Score

10^/10

gurcu collection stealer

Malware Config

Extracted

Family

gurcu

https://api.telegram.org/bot5948365373:AAHGoShKq2YoPLHuMrakRbVNthbMABFYHUc/sendMessage?chat_id=-1001620069625

Signatures

Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
stealer gurcu

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3346939869-2835594282-3775165920-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-3346939869-2835594282-3775165920-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-3346939869-2835594282-3775165920-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

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
84	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4768 set thread context of 2140	4768	buildlogs.exe	67

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2492	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2140	AppLaunch.exe
2140	AppLaunch.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2140	AppLaunch.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4768 wrote to memory of 2140	4768	buildlogs.exe	67
PID 4768 wrote to memory of 2140	4768	buildlogs.exe	67
PID 4768 wrote to memory of 2140	4768	buildlogs.exe	67
PID 4768 wrote to memory of 2140	4768	buildlogs.exe	67
PID 4768 wrote to memory of 2140	4768	buildlogs.exe	67
PID 2140 wrote to memory of 5092	2140	AppLaunch.exe	69
PID 2140 wrote to memory of 5092	2140	AppLaunch.exe	69
PID 2140 wrote to memory of 5092	2140	AppLaunch.exe	69
PID 5092 wrote to memory of 4120	5092	cmd.exe	71
PID 5092 wrote to memory of 4120	5092	cmd.exe	71
PID 5092 wrote to memory of 4120	5092	cmd.exe	71
PID 5092 wrote to memory of 2492	5092	cmd.exe	72
PID 5092 wrote to memory of 2492	5092	cmd.exe	72
PID 5092 wrote to memory of 2492	5092	cmd.exe	72

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3346939869-2835594282-3775165920-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3346939869-2835594282-3775165920-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

C:\Users\Admin\AppData\Local\Temp\buildlogs.exe
"C:\Users\Admin\AppData\Local\Temp\buildlogs.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4768
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
  "C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319\\AppLaunch.exe"
  2⤵
  - Accesses Microsoft Outlook profiles
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  - outlook_office_path
  - outlook_win_path
  PID:2140
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && DEL /F /S /Q /A "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:5092
  - - C:\Windows\SysWOW64\chcp.com
      chcp 65001
      4⤵
      PID:4120
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1
      4⤵
      Runs ping.exe
      PID:2492

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Remote System Discovery

T1018

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/2140-121-0x0000000000400000-0x0000000000458000-memory.dmp

Filesize
352KB

Download
memory/2140-145-0x00000000096F0000-0x0000000009700000-memory.dmp

Filesize
64KB

Download
memory/2140-650-0x0000000009C80000-0x0000000009D12000-memory.dmp

Filesize
584KB

Download
memory/2140-652-0x000000000BF30000-0x000000000C42E000-memory.dmp

Filesize
5.0MB

Download
memory/2140-655-0x0000000009D20000-0x0000000009D86000-memory.dmp

Filesize
408KB

Download
memory/2140-760-0x00000000096F0000-0x0000000009700000-memory.dmp

Filesize
64KB

Download