gurcu | 0e750fdf87d5db48b182f344f666588d5e293b174bb9699ff6b7bc1f17dce12e

Analysis

max time kernel
127s
max time network
153s
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, 09:38

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General

Target
ab9ef5fe8ae026b27c4c205e01a5859d.exe
Size 97KB
Sample230908-ll45ksae52
SHA256 0e750fdf87d5db48b182f344f666588d5e293b174bb9699ff6b7bc1f17dce12e
MD5 ab9ef5fe8ae026b27c4c205e01a5859d
SHA1 42897bc1dcc71fe5d7004d826a361d9900dee6fd
SHA512 3a71cb76da5150043f64388719c23306d6786613632f248d1e0bcc8247b424477777bcb7c488890acb78d4cc9342c27e39a03165aee434b9184dae79994444b4
SSDEEP 3072:T58ua64iBLV+8Boccwbl9bpoJQXLz/Cdf+BA6FVT/Dy:XVZywZ9bpsWv/CoBA6Fpu
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 1 IoCs

resource	yara_rule
behavioral2/memory/928-0-0x0000025355A10000-0x0000025355A2E000-memory.dmp	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-1-5-21-2415528079-3794552930-4264847036-1000\Control Panel\International\Geo\Nation	ab9ef5fe8ae026b27c4c205e01a5859d.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-1-5-21-2415528079-3794552930-4264847036-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	ab9ef5fe8ae026b27c4c205e01a5859d.exe
Key opened	\REGISTRY\USER\S-1-5-21-2415528079-3794552930-4264847036-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	ab9ef5fe8ae026b27c4c205e01a5859d.exe
Key opened	\REGISTRY\USER\S-1-5-21-2415528079-3794552930-4264847036-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	ab9ef5fe8ae026b27c4c205e01a5859d.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
5	ip-api.com

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

System Information Discovery
T1082

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1884	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
928	ab9ef5fe8ae026b27c4c205e01a5859d.exe
928	ab9ef5fe8ae026b27c4c205e01a5859d.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	928	ab9ef5fe8ae026b27c4c205e01a5859d.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 928 wrote to memory of 4100	928	ab9ef5fe8ae026b27c4c205e01a5859d.exe	92
PID 928 wrote to memory of 4100	928	ab9ef5fe8ae026b27c4c205e01a5859d.exe	92
PID 4100 wrote to memory of 2600	4100	cmd.exe	94
PID 4100 wrote to memory of 2600	4100	cmd.exe	94
PID 4100 wrote to memory of 1884	4100	cmd.exe	95
PID 4100 wrote to memory of 1884	4100	cmd.exe	95

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2415528079-3794552930-4264847036-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	ab9ef5fe8ae026b27c4c205e01a5859d.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2415528079-3794552930-4264847036-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	ab9ef5fe8ae026b27c4c205e01a5859d.exe

C:\Users\Admin\AppData\Local\Temp\ab9ef5fe8ae026b27c4c205e01a5859d.exe
"C:\Users\Admin\AppData\Local\Temp\ab9ef5fe8ae026b27c4c205e01a5859d.exe"
1⤵
- Checks computer location settings
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
PID:928
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\ab9ef5fe8ae026b27c4c205e01a5859d.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4100
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2600
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:1884

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

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

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Downloads

memory/928-0-0x0000025355A10000-0x0000025355A2E000-memory.dmp

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memory/928-1-0x00007FFAC8BE0000-0x00007FFAC96A1000-memory.dmp

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memory/928-2-0x0000025356090000-0x00000253560A0000-memory.dmp

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memory/928-5-0x00007FFAC8BE0000-0x00007FFAC96A1000-memory.dmp

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