gurcu | a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647 | Triage™

Resubmissions

10/04/2024, 02:56

240410-dff7kacd2410

10/04/2024, 02:56

240410-de3zyacc9610

10/04/2024, 02:56

240410-de3deaff6t10

10/04/2024, 02:56

240410-de23msff6s10

09/09/2023, 14:35

230909-rx47lsbh5210

Analysis

max time kernel
72s
max time network
188s
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, 02:56

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General

Target
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Size 119KB
Sample240410-de23msff6s
SHA256 a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647
MD5 369204590ce91e77109e21a298753522
SHA1 e981f0c86c42e9e8fcbc7dcff0e05c35887a3869
SHA512 bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32
SSDEEP 3072:P56Q4BB1q/hJcq4YZRKsySYSLLx9yLjj6TG6WVt9bm+EFyW43LORzMJS/3:Fha6BuQdwLKTGLt9bmhD4q1Mc
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

gurcu collection spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 2 IoCs

resource	yara_rule
behavioral2/memory/5084-0-0x0000015F70720000-0x0000015F70744000-memory.dmp	family_gurcu_v3
behavioral2/files/0x000800000001abbb-8.dat	family_gurcu_v3

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

Executes dropped EXE 2 IoCs

pid	Process
2364	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
4132	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.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

Email Collection

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1739856679-3467441365-73334005-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Key opened	\REGISTRY\USER\S-1-5-21-1739856679-3467441365-73334005-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Key opened	\REGISTRY\USER\S-1-5-21-1739856679-3467441365-73334005-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Key opened	\REGISTRY\USER\S-1-5-21-1739856679-3467441365-73334005-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Key opened	\REGISTRY\USER\S-1-5-21-1739856679-3467441365-73334005-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Key opened	\REGISTRY\USER\S-1-5-21-1739856679-3467441365-73334005-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.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
2	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.

Scheduled Task/Job

pid	Process
3480	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

pid	Process
2320	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2364	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
4132	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	5084	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Token: SeDebugPrivilege	2364	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Token: SeDebugPrivilege	4132	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 5084 wrote to memory of 244	5084	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe	74
PID 5084 wrote to memory of 244	5084	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe	74
PID 244 wrote to memory of 628	244	cmd.exe	76
PID 244 wrote to memory of 628	244	cmd.exe	76
PID 244 wrote to memory of 2320	244	cmd.exe	77
PID 244 wrote to memory of 2320	244	cmd.exe	77
PID 244 wrote to memory of 3480	244	cmd.exe	78
PID 244 wrote to memory of 3480	244	cmd.exe	78
PID 244 wrote to memory of 2364	244	cmd.exe	79
PID 244 wrote to memory of 2364	244	cmd.exe	79

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-1-5-21-1739856679-3467441365-73334005-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1739856679-3467441365-73334005-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe

C:\Users\Admin\AppData\Local\Temp\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
"C:\Users\Admin\AppData\Local\Temp\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5084
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:244
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:628
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:2320
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3480
- - C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
    "C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2364

C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
1⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
PID:4132

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Persistence

Scheduled Task/Job

Privilege Escalation

Scheduled Task/Job

Defense Evasion

Credential Access

Unsecured Credentials

Credentials In Files

Credentials in Registry

Discovery

Query Registry

Remote System Discovery

System Information Discovery

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

port.dat

Path C:\Users\Admin\AppData\Local\84tnjh4449\port.dat
Size 4B
SHA256 5edcf3b4d5f63d095b027a02182f2783e2bcdb36e2d8210617364fcce9da2df1
MD5 2377f9eb902f3c5855aca19197689b14
SHA1 113212e51e8b2950748f7305c7ad9dad7104b605
SHA512 fa28edcd9a176477b33a8c4cc93b1791efc69bdad5058a3df16d3990e5b7b3a50496cb48c259ab27a7eb7d93b89da939f3d214472a157d44ea0b6475f3d1f888
MD5 SHA1 SHA512

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a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe

Path C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Size 119KB
SHA256 a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647
MD5 369204590ce91e77109e21a298753522
SHA1 e981f0c86c42e9e8fcbc7dcff0e05c35887a3869
SHA512 bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32
SSDEEP 3072:P56Q4BB1q/hJcq4YZRKsySYSLLx9yLjj6TG6WVt9bm+EFyW43LORzMJS/3:Fha6BuQdwLKTGLt9bmhD4q1Mc
MD5 SHA1 SHA512 SSDEEP

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a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe.log
Size 847B
SHA256 cae801b0499949178298c1c1a083f7c0febb971d262be9c9588437af66c76ef0
MD5 a908a7c6e93edeb3e400780b6fe62dde
SHA1 36e2b437f41443f6b41b45b35a0f97b2cd94123d
SHA512 deb437dcb1440d37bcd61dfa43be05fd01856a1d1e59aa5b2dfa142e9ae584b0577eea024edb99d8e74e3a1b606bb7ae3b4f9cd8eb30813e67dda678b9319cbe
MD5 SHA1 SHA512

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installUtilLog.txt

Path C:\Users\Admin\AppData\Local\Temp\installUtilLog.txt
Size 82B
SHA256 8f8cc850ea7e227ba100ad943c4c9000857e39d66a0aa6a245f599e6868d04c2
MD5 1d2c0986ba3c3af924ad4b8776a45190
SHA1 e4199810598c592fb4304eb37cf90d2ce2065a11
SHA512 275f4de2999bc947be2a179aab2ed6e33d7591d3464d3ba43d3ca1b6fc0ada3aae2090f39dc3620bfcfa57824e26aba7b401145137f87115bbd4c3589a291524
MD5 SHA1 SHA512

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memory/2364-17-0x00007FF8E9AD0000-0x00007FF8EA4BC000-memory.dmp

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memory/2364-21-0x00000241FE1B0000-0x00000241FE1C0000-memory.dmp

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memory/2364-11-0x00007FF8E9AD0000-0x00007FF8EA4BC000-memory.dmp

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memory/2364-12-0x00000241FE1B0000-0x00000241FE1C0000-memory.dmp

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memory/4132-18-0x00007FF8E9AD0000-0x00007FF8EA4BC000-memory.dmp

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memory/4132-19-0x000002526CD30000-0x000002526CD40000-memory.dmp

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memory/4132-25-0x00007FF8E9AD0000-0x00007FF8EA4BC000-memory.dmp

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memory/5084-0-0x0000015F70720000-0x0000015F70744000-memory.dmp

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memory/5084-6-0x00007FF8E9AD0000-0x00007FF8EA4BC000-memory.dmp

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memory/5084-4-0x0000015F72D50000-0x0000015F72D60000-memory.dmp

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memory/5084-3-0x00007FF8E9AD0000-0x00007FF8EA4BC000-memory.dmp

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