gurcu | a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647 | Triage

Resubmissions

10-04-2024 02:56

240410-dff7kacd24 10

10-04-2024 02:56

240410-de3zyacc96 10

10-04-2024 02:56

240410-de3deaff6t 10

10-04-2024 02:56

240410-de23msff6s 10

09-09-2023 14:35

230909-rx47lsbh52 10

Analysis

max time kernel
315s
max time network
1600s
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

Sharing

Report Analysis Logs

General

Target

a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Size

119KB
MD5

369204590ce91e77109e21a298753522
SHA1

e981f0c86c42e9e8fcbc7dcff0e05c35887a3869
SHA256

a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647
SHA512

bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32
SSDEEP

3072:P56Q4BB1q/hJcq4YZRKsySYSLLx9yLjj6TG6WVt9bm+EFyW43LORzMJS/3:Fha6BuQdwLKTGLt9bmhD4q1Mc

Score

10^/10

gurcu collection spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 2 IoCs

resource	yara_rule
behavioral2/memory/1744-0-0x0000016B01520000-0x0000016B01544000-memory.dmp	family_gurcu_v3
behavioral2/files/0x000800000001ab9f-9.dat	family_gurcu_v3

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

Executes dropped EXE 2 IoCs

pid	Process
4524	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
4720	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\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
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

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
2	ip-api.com
13	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
240	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

pid	Process
1184	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4524	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
4720	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1744	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Token: SeDebugPrivilege	4524	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe
Token: SeDebugPrivilege	4720	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1744 wrote to memory of 4276	1744	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe	72
PID 1744 wrote to memory of 4276	1744	a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe	72
PID 4276 wrote to memory of 4388	4276	cmd.exe	74
PID 4276 wrote to memory of 4388	4276	cmd.exe	74
PID 4276 wrote to memory of 1184	4276	cmd.exe	75
PID 4276 wrote to memory of 1184	4276	cmd.exe	75
PID 4276 wrote to memory of 240	4276	cmd.exe	76
PID 4276 wrote to memory of 240	4276	cmd.exe	76
PID 4276 wrote to memory of 4524	4276	cmd.exe	77
PID 4276 wrote to memory of 4524	4276	cmd.exe	77

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:1744
- 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:4276
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:4388
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:1184
- - 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:240
- - 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:4524

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:4720

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

C:\Users\Admin\AppData\Local\84tnjh4449\port.dat

Filesize
4B

MD5
edb947f2bbceb132245fdde9c59d3f59

SHA1
e6ceb92b27cca670e019a54eebac105a64f1c6fc

SHA256
d554f1a19f5ac3d3144ca19b16bf4051bd6451545fdcb290be87c20e62903a76

SHA512
488e6f7ad7ab5c6b05b8ebcfe5aa74b5c6d75e89833e8a501b7ba5456502720fe445e5c3cc35228f083f7cedae2ed29ef92bf4d779d1e0551caf3b314525f117

Download Submit
C:\Users\Admin\AppData\Local\EsetSecurity\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe

Filesize
119KB

MD5
369204590ce91e77109e21a298753522

SHA1
e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

SHA256
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

SHA512
bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647exe_JC.exe.log

Filesize
847B

MD5
a908a7c6e93edeb3e400780b6fe62dde

SHA1
36e2b437f41443f6b41b45b35a0f97b2cd94123d

SHA256
cae801b0499949178298c1c1a083f7c0febb971d262be9c9588437af66c76ef0

SHA512
deb437dcb1440d37bcd61dfa43be05fd01856a1d1e59aa5b2dfa142e9ae584b0577eea024edb99d8e74e3a1b606bb7ae3b4f9cd8eb30813e67dda678b9319cbe

Download Submit
C:\Users\Admin\AppData\Local\Temp\installUtilLog.txt

Filesize
82B

MD5
1d2c0986ba3c3af924ad4b8776a45190

SHA1
e4199810598c592fb4304eb37cf90d2ce2065a11

SHA256
8f8cc850ea7e227ba100ad943c4c9000857e39d66a0aa6a245f599e6868d04c2

SHA512
275f4de2999bc947be2a179aab2ed6e33d7591d3464d3ba43d3ca1b6fc0ada3aae2090f39dc3620bfcfa57824e26aba7b401145137f87115bbd4c3589a291524

Download Submit
memory/1744-3-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp

Filesize
9.9MB

Download
memory/1744-6-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp

Filesize
9.9MB

Download
memory/1744-0-0x0000016B01520000-0x0000016B01544000-memory.dmp

Filesize
144KB

Download
memory/1744-4-0x0000016B1BD10000-0x0000016B1BD20000-memory.dmp

Filesize
64KB

Download
memory/4524-17-0x0000025BA34B0000-0x0000025BA34C0000-memory.dmp

Filesize
64KB

Download
memory/4524-12-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp

Filesize
9.9MB

Download
memory/4524-16-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp

Filesize
9.9MB

Download
memory/4524-13-0x0000025BA34B0000-0x0000025BA34C0000-memory.dmp

Filesize
64KB

Download
memory/4720-19-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp

Filesize
9.9MB

Download
memory/4720-20-0x000001A62A700000-0x000001A62A710000-memory.dmp

Filesize
64KB

Download
memory/4720-25-0x00007FFC0C720000-0x00007FFC0D10C000-memory.dmp

Filesize
9.9MB

Download
memory/4720-26-0x000001A62A700000-0x000001A62A710000-memory.dmp

Filesize
64KB

Download