gurcu | 67474d56996cadf242c087aeac455357bd33e79545538eeade15ae259fb3e869 | Triage

Resubmissions

10-04-2024 02:29

240410-cy22baca54 10

10-04-2024 02:29

240410-cy2esafc8z 10

10-04-2024 02:29

240410-cy1s9aca52 10

10-04-2024 02:29

240410-cy1hgsfc8x 10

14-10-2023 01:29

231014-bwm9pshg4t 10

Analysis

max time kernel
193s
max time network
302s
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 02:29

Sharing

Report Analysis Logs

General

Target

D5f0a5d17c7420fe49da676.exe
Size

250KB
MD5

24a8408510d9b173b9dc078574261d28
SHA1

2ecfc788687aadbd9cc42ea311210f7cde5fa064
SHA256

67474d56996cadf242c087aeac455357bd33e79545538eeade15ae259fb3e869
SHA512

de51ce9f9df68a688e7a8092aa70210ba07a9d7738ea731e2e8a7e724b3fc73cd77e83f63d675f6a1def373b437af533e1fdc688ddf1bfb94477277a8e74a5a9
SSDEEP

6144:PY6+lYxyWoekN4B2We2TxT8jWHgf8YJkVHC++VeQPBZnq0LZYSwFxQx9tjQ9bMXq:PxpmWHgf8Y6/Qp1nLiDKhFX

Score

10^/10

gurcu collection spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 2 IoCs

resource	yara_rule
behavioral2/memory/4720-0-0x000001D694960000-0x000001D6949A4000-memory.dmp	family_gurcu_v3
behavioral2/files/0x000800000001ac10-8.dat	family_gurcu_v3

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

Executes dropped EXE 2 IoCs

pid	Process
4308	D5f0a5d17c7420fe49da676.exe
1124	D5f0a5d17c7420fe49da676.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-1-5-21-3727096518-2913484142-3593445157-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.exe
Key opened	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.exe
Key opened	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.exe
Key opened	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.exe
Key opened	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.exe
Key opened	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.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
3	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
4464	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

pid	Process
1140	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4308	D5f0a5d17c7420fe49da676.exe
1124	D5f0a5d17c7420fe49da676.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4720	D5f0a5d17c7420fe49da676.exe
Token: SeDebugPrivilege	4308	D5f0a5d17c7420fe49da676.exe
Token: SeDebugPrivilege	1124	D5f0a5d17c7420fe49da676.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4720 wrote to memory of 880	4720	D5f0a5d17c7420fe49da676.exe	73
PID 4720 wrote to memory of 880	4720	D5f0a5d17c7420fe49da676.exe	73
PID 880 wrote to memory of 4604	880	cmd.exe	75
PID 880 wrote to memory of 4604	880	cmd.exe	75
PID 880 wrote to memory of 1140	880	cmd.exe	76
PID 880 wrote to memory of 1140	880	cmd.exe	76
PID 880 wrote to memory of 4464	880	cmd.exe	77
PID 880 wrote to memory of 4464	880	cmd.exe	77
PID 880 wrote to memory of 4308	880	cmd.exe	78
PID 880 wrote to memory of 4308	880	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-1-5-21-3727096518-2913484142-3593445157-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.exe

C:\Users\Admin\AppData\Local\Temp\D5f0a5d17c7420fe49da676.exe
"C:\Users\Admin\AppData\Local\Temp\D5f0a5d17c7420fe49da676.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4720
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "D5f0a5d17c7420fe49da676" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\D5f0a5d17c7420fe49da676.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:880
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:4604
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:1140
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "D5f0a5d17c7420fe49da676" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:4464
- - C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe
    "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4308

C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe
C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe
1⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
PID:1124

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\6rfb5r0uff\port.dat

Filesize
4B

MD5
f5e62af885293cf4d511ceef31e61c80

SHA1
f933be252dfed9664ffdf6d6a9b4c5e9d3abe76e

SHA256
10ec7498052c63661dff4f864feecbd58fd9099d0a46fd8c1ebee73fc23f4a02

SHA512
dccfaa360a0ea39382d57b16bdbeb95d029301ecc5a91f482c267e233225692409c9ba20c13e7f730405037aae1cae2209d394e21899a231a4459649f58d461f

Download Submit
C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe

Filesize
250KB

MD5
24a8408510d9b173b9dc078574261d28

SHA1
2ecfc788687aadbd9cc42ea311210f7cde5fa064

SHA256
67474d56996cadf242c087aeac455357bd33e79545538eeade15ae259fb3e869

SHA512
de51ce9f9df68a688e7a8092aa70210ba07a9d7738ea731e2e8a7e724b3fc73cd77e83f63d675f6a1def373b437af533e1fdc688ddf1bfb94477277a8e74a5a9

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\D5f0a5d17c7420fe49da676.exe.log

Filesize
1KB

MD5
d51a38b0538aafbb39cd4743767cf2a3

SHA1
ec819ad7959110e2244b2978e4a60e4c5e99961d

SHA256
8678df64deb4a7203a8ac3eaa5af8b767111e753385d286f9e1c121d45830e22

SHA512
51ffb0c793f034843cf749716680bb6dd81c840bbe22f6426c8d14ffd62a7b4fab974325aa978e62ba57575b836aff4e00a810688818749021f658b623fd41f2

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

Filesize
82B

MD5
1d2c0986ba3c3af924ad4b8776a45190

SHA1
e4199810598c592fb4304eb37cf90d2ce2065a11

SHA256
8f8cc850ea7e227ba100ad943c4c9000857e39d66a0aa6a245f599e6868d04c2

SHA512
275f4de2999bc947be2a179aab2ed6e33d7591d3464d3ba43d3ca1b6fc0ada3aae2090f39dc3620bfcfa57824e26aba7b401145137f87115bbd4c3589a291524

Download Submit
memory/1124-20-0x000001CE69F50000-0x000001CE69F60000-memory.dmp

Filesize
64KB

Download
memory/1124-19-0x00007FFEC8910000-0x00007FFEC92FC000-memory.dmp

Filesize
9.9MB

Download
memory/1124-25-0x00007FFEC8910000-0x00007FFEC92FC000-memory.dmp

Filesize
9.9MB

Download
memory/1124-26-0x000001CE69F50000-0x000001CE69F60000-memory.dmp

Filesize
64KB

Download
memory/4308-11-0x00007FFEC8910000-0x00007FFEC92FC000-memory.dmp

Filesize
9.9MB

Download
memory/4308-17-0x000001E976250000-0x000001E976260000-memory.dmp

Filesize
64KB

Download
memory/4308-12-0x000001E976250000-0x000001E976260000-memory.dmp

Filesize
64KB

Download
memory/4308-16-0x00007FFEC8910000-0x00007FFEC92FC000-memory.dmp

Filesize
9.9MB

Download
memory/4720-0-0x000001D694960000-0x000001D6949A4000-memory.dmp

Filesize
272KB

Download
memory/4720-2-0x000001D6AF000000-0x000001D6AF010000-memory.dmp

Filesize
64KB

Download
memory/4720-1-0x00007FFEC8910000-0x00007FFEC92FC000-memory.dmp

Filesize
9.9MB

Download
memory/4720-6-0x00007FFEC8910000-0x00007FFEC92FC000-memory.dmp

Filesize
9.9MB

Download