gurcu | fe3f4e398b6d08758c70582e76aaf99c5f917de8a05ad9d67a884a07f695f015

General

Target

g8ae371b2e5be4d5d2d0c05.exe
Size

290KB
MD5

24acb6ae0ce3f02db7e54d5938e6fa0e
SHA1

7da01643bf195b0b11e0afbcf0c4c65056c54627
SHA256

fe3f4e398b6d08758c70582e76aaf99c5f917de8a05ad9d67a884a07f695f015
SHA512

a4125cb350943943223f6def0e6a06b05bebc85d0af857a04471cc93c1a2f605fc305301a1d91814c31a4c58a4d973c3ae0180fffe15d4d2ae178fc845d7371e
SSDEEP

6144:0GPJDpTxT8jWHgf8YJkVHC++VeQPBZnq0LZYSwFxQx9t0B9bdKoqeUIJkDa:7RpmWHgf8Y6/Qp1nLiDKkKyka

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 1 IoCs

resource	yara_rule
behavioral2/memory/2648-0-0x0000020763490000-0x00000207634DE000-memory.dmp	family_gurcu_v3

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

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	g8ae371b2e5be4d5d2d0c05.exe
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	g8ae371b2e5be4d5d2d0c05.exe
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	g8ae371b2e5be4d5d2d0c05.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

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
17	ip-api.com

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2648	g8ae371b2e5be4d5d2d0c05.exe
2648	g8ae371b2e5be4d5d2d0c05.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2648	g8ae371b2e5be4d5d2d0c05.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2648 wrote to memory of 3696	2648	g8ae371b2e5be4d5d2d0c05.exe	85
PID 2648 wrote to memory of 3696	2648	g8ae371b2e5be4d5d2d0c05.exe	85
PID 3696 wrote to memory of 2620	3696	cmd.exe	87
PID 3696 wrote to memory of 2620	3696	cmd.exe	87
PID 3696 wrote to memory of 740	3696	cmd.exe	88
PID 3696 wrote to memory of 740	3696	cmd.exe	88
PID 3696 wrote to memory of 4432	3696	cmd.exe	89
PID 3696 wrote to memory of 4432	3696	cmd.exe	89
PID 2648 wrote to memory of 2452	2648	g8ae371b2e5be4d5d2d0c05.exe	90
PID 2648 wrote to memory of 2452	2648	g8ae371b2e5be4d5d2d0c05.exe	90
PID 2452 wrote to memory of 2348	2452	cmd.exe	92
PID 2452 wrote to memory of 2348	2452	cmd.exe	92
PID 2452 wrote to memory of 4112	2452	cmd.exe	93
PID 2452 wrote to memory of 4112	2452	cmd.exe	93
PID 2452 wrote to memory of 4808	2452	cmd.exe	94
PID 2452 wrote to memory of 4808	2452	cmd.exe	94

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	g8ae371b2e5be4d5d2d0c05.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	g8ae371b2e5be4d5d2d0c05.exe

C:\Users\Admin\AppData\Local\Temp\g8ae371b2e5be4d5d2d0c05.exe
"C:\Users\Admin\AppData\Local\Temp\g8ae371b2e5be4d5d2d0c05.exe"
1⤵
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
PID:2648
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3696
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2620
- - C:\Windows\system32\netsh.exe
    netsh wlan show profiles
    3⤵
    PID:740
- - C:\Windows\system32\findstr.exe
    findstr /R /C:"[ ]:[ ]"
    3⤵
    PID:4432
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2452
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2348
- - C:\Windows\system32\netsh.exe
    netsh wlan show networks mode=bssid
    3⤵
    PID:4112
- - C:\Windows\system32\findstr.exe
    findstr "SSID BSSID Signal"
    3⤵
    PID:4808

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2648-0-0x0000020763490000-0x00000207634DE000-memory.dmp

Filesize
312KB

Download
memory/2648-1-0x00007FFC2F380000-0x00007FFC2FE41000-memory.dmp

Filesize
10.8MB

Download
memory/2648-2-0x000002077D9A0000-0x000002077D9B0000-memory.dmp

Filesize
64KB

Download
memory/2648-3-0x00007FFC2F380000-0x00007FFC2FE41000-memory.dmp

Filesize
10.8MB

Download
memory/2648-4-0x000002077D9A0000-0x000002077D9B0000-memory.dmp

Filesize
64KB

Download

Analysis

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