gurcu | a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

Analysis

max time kernel
141s
max time network
150s
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 09:48

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

369204590CE91E77109E21A298753522.exe
Size

119KB
MD5

369204590ce91e77109e21a298753522
SHA1

e981f0c86c42e9e8fcbc7dcff0e05c35887a3869
SHA256

a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647
SHA512

bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32
SSDEEP

3072:P56Q4BB1q/hJcq4YZRKsySYSLLx9yLjj6TG6WVt9bm+EFyW43LORzMJS/3:Fha6BuQdwLKTGLt9bmhD4q1Mc

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 3 IoCs

resource	yara_rule
behavioral2/memory/2692-0-0x0000023960CB0000-0x0000023960CD4000-memory.dmp	family_gurcu_v3
behavioral2/files/0x0007000000023253-8.dat	family_gurcu_v3
behavioral2/files/0x0007000000023253-9.dat	family_gurcu_v3

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

Checks computer location settings 2 TTPs 2 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-1-5-21-1859779917-101786662-3680946609-1000\Control Panel\International\Geo\Nation	369204590CE91E77109E21A298753522.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1859779917-101786662-3680946609-1000\Control Panel\International\Geo\Nation	369204590CE91E77109E21A298753522.exe

Executes dropped EXE 2 IoCs

pid	Process
4760	369204590CE91E77109E21A298753522.exe
5068	tor.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-1-5-21-1859779917-101786662-3680946609-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	369204590CE91E77109E21A298753522.exe
Key opened	\REGISTRY\USER\S-1-5-21-1859779917-101786662-3680946609-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	369204590CE91E77109E21A298753522.exe
Key opened	\REGISTRY\USER\S-1-5-21-1859779917-101786662-3680946609-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	369204590CE91E77109E21A298753522.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
37	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
1500	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2312	PING.EXE

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
4760	369204590CE91E77109E21A298753522.exe
4760	369204590CE91E77109E21A298753522.exe
4760	369204590CE91E77109E21A298753522.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2692	369204590CE91E77109E21A298753522.exe
Token: SeDebugPrivilege	4760	369204590CE91E77109E21A298753522.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4760	369204590CE91E77109E21A298753522.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2692 wrote to memory of 1256	2692	369204590CE91E77109E21A298753522.exe	85
PID 2692 wrote to memory of 1256	2692	369204590CE91E77109E21A298753522.exe	85
PID 1256 wrote to memory of 1084	1256	cmd.exe	87
PID 1256 wrote to memory of 1084	1256	cmd.exe	87
PID 1256 wrote to memory of 2312	1256	cmd.exe	88
PID 1256 wrote to memory of 2312	1256	cmd.exe	88
PID 1256 wrote to memory of 1500	1256	cmd.exe	94
PID 1256 wrote to memory of 1500	1256	cmd.exe	94
PID 1256 wrote to memory of 4760	1256	cmd.exe	95
PID 1256 wrote to memory of 4760	1256	cmd.exe	95
PID 4760 wrote to memory of 3004	4760	369204590CE91E77109E21A298753522.exe	98
PID 4760 wrote to memory of 3004	4760	369204590CE91E77109E21A298753522.exe	98
PID 4760 wrote to memory of 5068	4760	369204590CE91E77109E21A298753522.exe	101
PID 4760 wrote to memory of 5068	4760	369204590CE91E77109E21A298753522.exe	101

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-1-5-21-1859779917-101786662-3680946609-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	369204590CE91E77109E21A298753522.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1859779917-101786662-3680946609-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	369204590CE91E77109E21A298753522.exe

C:\Users\Admin\AppData\Local\Temp\369204590CE91E77109E21A298753522.exe
"C:\Users\Admin\AppData\Local\Temp\369204590CE91E77109E21A298753522.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2692
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "369204590CE91E77109E21A298753522" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\369204590CE91E77109E21A298753522.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1256
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:1084
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:2312
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "369204590CE91E77109E21A298753522" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1500
- - C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe
    "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    - outlook_office_path
    - outlook_win_path
    PID:4760
  - - C:\Windows\System32\tar.exe
      "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp92DA.tmp" -C "C:\Users\Admin\AppData\Local\84tnjh4449"
      4⤵
      PID:3004
  - - C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe
      "C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\84tnjh4449\torrc.txt"
      4⤵
      Executes dropped EXE
      PID:5068

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

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\84tnjh4449\data\cached-microdesc-consensus.tmp

Filesize
2.6MB

MD5
a16fb07bbf99c6183f970b4035eb661e

SHA1
8f62ae7875b0473da5b32feff18f468ce6912ef1

SHA256
f364c978e02cd9edc1e0c5728887a1b58c7382bb1a489a571eedcb09dd8c7b0a

SHA512
a81bea0d5ce95fced2089953d9b6e7d99ed5d46885549a5210ad12a6251d8ae4ae00072c246239cacb6cf10b238d71999cb98f3dbd301ab6b6184f737e0e3cbb

Download Submit
C:\Users\Admin\AppData\Local\84tnjh4449\host\hostname

Filesize
64B

MD5
e6d1ac60cced392a534f9a7197d9f7ef

SHA1
1b6d8898f23c5b23f4c3ad5e77932f85285b02c0

SHA256
60a800c9f86f9cee82ed86e8d9915560e491ebc77dac3061f21b074571cd222c

SHA512
bc48a711544c8836065c0f93e43dbee324d9c82faa5610dc1f0dd6d43eaf76a0e503d679269b3dae8f403c6491f907bbdc36d22f252d1774d3e477c1a672c32c

Download Submit
C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\84tnjh4449\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\84tnjh4449\torrc.txt

Filesize
218B

MD5
c1f73f5dcb831bc091d0ccf9c6e666b7

SHA1
85086a0f8fd5a17b536f0771c847716c52c9f341

SHA256
f3e1e5dde0d0df60baf11ac64f07f32dcf6c4afc24136f8a3e979ef2f351793a

SHA512
c30fa53d86026cd91793bb2d915da2851655260682abf8a86e4fc39de473a6743628bff78f740336ae2b6632b7aaf63db4fbc81af950322c014c79e14e52aa71

Download Submit
C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe

Filesize
119KB

MD5
369204590ce91e77109e21a298753522

SHA1
e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

SHA256
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

SHA512
bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

Download Submit
C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe

Filesize
119KB

MD5
369204590ce91e77109e21a298753522

SHA1
e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

SHA256
a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

SHA512
bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\369204590CE91E77109E21A298753522.exe.log

Filesize
847B

MD5
3308a84a40841fab7dfec198b3c31af7

SHA1
4e7ab6336c0538be5dd7da529c0265b3b6523083

SHA256
169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

SHA512
97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp92DA.tmp

Filesize
13.3MB

MD5
89d2d5811c1aff539bb355f15f3ddad0

SHA1
5bb3577c25b6d323d927200c48cd184a3e27c873

SHA256
b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

SHA512
39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

Download Submit
memory/2692-0-0x0000023960CB0000-0x0000023960CD4000-memory.dmp

Filesize
144KB

Download
memory/2692-6-0x00007FFC43400000-0x00007FFC43EC1000-memory.dmp

Filesize
10.8MB

Download
memory/2692-2-0x000002397B2F0000-0x000002397B300000-memory.dmp

Filesize
64KB

Download
memory/2692-1-0x00007FFC43400000-0x00007FFC43EC1000-memory.dmp

Filesize
10.8MB

Download
memory/4760-11-0x00007FFC425A0000-0x00007FFC43061000-memory.dmp

Filesize
10.8MB

Download
memory/4760-12-0x000001896F9C0000-0x000001896F9D0000-memory.dmp

Filesize
64KB

Download
memory/4760-41-0x00007FFC425A0000-0x00007FFC43061000-memory.dmp

Filesize
10.8MB

Download
memory/4760-50-0x000001896F9C0000-0x000001896F9D0000-memory.dmp

Filesize
64KB

Download