gurcu | 8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3

Resubmissions

10-04-2024 02:58

240410-dgn9kacd46 10

10-04-2024 02:58

10-04-2024 02:58

10-04-2024 02:58

23-08-2023 14:58

Analysis

max time kernel
644s
max time network
1756s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
10-04-2024 02:58

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General

Target

loader.exe
Size

401KB
MD5

69e3cdc923b668aec4cb405c040565c6
SHA1

6a675ebf6f241e543f7bb50ccc8ead462a427880
SHA256

8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3
SHA512

5580919f6710fc210f079875eae22a87c85e854b57f59d10fc22680460f370154d7d223a66c9797387e4675a7954ba6f051a34571499481927980eb9ebf07cdb
SSDEEP

6144:+CGmWI/2hvRn6Ie646G0D1eBlxy9bAmI6:+KWI/8B6Q9b5eBlxnmI6

Score

10^/10

gurcu collection spyware stealer

Malware Config

Extracted

Family

gurcu

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
216	loader.exe
3684	loader.exe

Reads WinSCP keys stored on the system 2 TTPs
Tries to access WinSCP stored sessions.
spyware stealer

Data from Local System
T1005

Credentials in Registry
T1552.002
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 6 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3968772205-1713802336-1776639840-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe
Key opened	\REGISTRY\USER\S-1-5-21-3968772205-1713802336-1776639840-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe
Key opened	\REGISTRY\USER\S-1-5-21-3968772205-1713802336-1776639840-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe
Key opened	\REGISTRY\USER\S-1-5-21-3968772205-1713802336-1776639840-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe
Key opened	\REGISTRY\USER\S-1-5-21-3968772205-1713802336-1776639840-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe
Key opened	\REGISTRY\USER\S-1-5-21-3968772205-1713802336-1776639840-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.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
49	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
396	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2664	PING.EXE

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4684	loader.exe
Token: SeDebugPrivilege	216	loader.exe
Token: SeDebugPrivilege	3684	loader.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4684 wrote to memory of 96	4684	loader.exe	73
PID 4684 wrote to memory of 96	4684	loader.exe	73
PID 96 wrote to memory of 2292	96	cmd.exe	75
PID 96 wrote to memory of 2292	96	cmd.exe	75
PID 96 wrote to memory of 2664	96	cmd.exe	76
PID 96 wrote to memory of 2664	96	cmd.exe	76
PID 96 wrote to memory of 396	96	cmd.exe	77
PID 96 wrote to memory of 396	96	cmd.exe	77
PID 96 wrote to memory of 216	96	cmd.exe	78
PID 96 wrote to memory of 216	96	cmd.exe	78

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-1-5-21-3968772205-1713802336-1776639840-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3968772205-1713802336-1776639840-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe

C:\Users\Admin\AppData\Local\Temp\loader.exe
"C:\Users\Admin\AppData\Local\Temp\loader.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4684
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\loader.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:96
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2292
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:2664
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:396
- - C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
    "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious use of AdjustPrivilegeToken
    PID:216

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
PID:3684

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

Credentials in Registry

T1552.002

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

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

Filesize
847B

MD5
a908a7c6e93edeb3e400780b6fe62dde

SHA1
36e2b437f41443f6b41b45b35a0f97b2cd94123d

SHA256
cae801b0499949178298c1c1a083f7c0febb971d262be9c9588437af66c76ef0

SHA512
deb437dcb1440d37bcd61dfa43be05fd01856a1d1e59aa5b2dfa142e9ae584b0577eea024edb99d8e74e3a1b606bb7ae3b4f9cd8eb30813e67dda678b9319cbe

Download Submit
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe

Filesize
401KB

MD5
69e3cdc923b668aec4cb405c040565c6

SHA1
6a675ebf6f241e543f7bb50ccc8ead462a427880

SHA256
8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3

SHA512
5580919f6710fc210f079875eae22a87c85e854b57f59d10fc22680460f370154d7d223a66c9797387e4675a7954ba6f051a34571499481927980eb9ebf07cdb

Download Submit
C:\Users\Admin\AppData\Local\jjmzzxbvaf\port.dat

Filesize
4B

MD5
663772ea088360f95bac3dc7ffb841be

SHA1
3ce11065969d6f489db06446d4d074c6f9a052fc

SHA256
67be10d98e9ab6d770578f47763baa3bec8e6b3ce68f323cafe00a65ffa43f0d

SHA512
575c925a5bb367f9edb71ba57a6db5a1863318839ca4520e88d99e067cc0ce821cb2e7cd1d84ea8033cc48e2ffae0d8fd0336feef79dbefcfc30d7101c540887

Download Submit
memory/216-17-0x000001F278AF0000-0x000001F278B00000-memory.dmp

Filesize
64KB

Download
memory/216-11-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp

Filesize
9.9MB

Download
memory/216-12-0x000001F278AF0000-0x000001F278B00000-memory.dmp

Filesize
64KB

Download
memory/216-15-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp

Filesize
9.9MB

Download
memory/3684-19-0x0000021076600000-0x0000021076610000-memory.dmp

Filesize
64KB

Download
memory/3684-18-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp

Filesize
9.9MB

Download
memory/3684-22-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp

Filesize
9.9MB

Download
memory/3684-23-0x0000021076600000-0x0000021076610000-memory.dmp

Filesize
64KB

Download
memory/4684-6-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp

Filesize
9.9MB

Download
memory/4684-2-0x0000021B62120000-0x0000021B62130000-memory.dmp

Filesize
64KB

Download
memory/4684-0-0x0000021B47BE0000-0x0000021B47C48000-memory.dmp

Filesize
416KB

Download
memory/4684-1-0x00007FFA56E20000-0x00007FFA5780C000-memory.dmp

Filesize
9.9MB

Download

Resubmissions

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads