gurcu | 67474d56996cadf242c087aeac455357bd33e79545538eeade15ae259fb3e869

Analysis

max time kernel
145s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20230831-en
resource tags

arch:x64arch:x86image:win10v2004-20230831-enlocale:en-usos:windows10-2004-x64system
submitted
14-09-2023 10:44

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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 discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 3 IoCs

resource	yara_rule
behavioral2/memory/4228-0-0x000001F251D50000-0x000001F251D94000-memory.dmp	family_gurcu_v3
behavioral2/files/0x000700000002320a-8.dat	family_gurcu_v3
behavioral2/files/0x000700000002320a-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-1-5-21-528036852-1341495193-1175965888-1000\Control Panel\International\Geo\Nation	D5f0a5d17c7420fe49da676.exe
Key value queried	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Control Panel\International\Geo\Nation	D5f0a5d17c7420fe49da676.exe

Executes dropped EXE 2 IoCs

pid	Process
2928	D5f0a5d17c7420fe49da676.exe
1312	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-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.exe
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.exe
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.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
39	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
3384	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3660	PING.EXE

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2928	D5f0a5d17c7420fe49da676.exe
2928	D5f0a5d17c7420fe49da676.exe
2928	D5f0a5d17c7420fe49da676.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4228	D5f0a5d17c7420fe49da676.exe
Token: SeDebugPrivilege	2928	D5f0a5d17c7420fe49da676.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4228 wrote to memory of 2160	4228	D5f0a5d17c7420fe49da676.exe	88
PID 4228 wrote to memory of 2160	4228	D5f0a5d17c7420fe49da676.exe	88
PID 2160 wrote to memory of 4676	2160	cmd.exe	90
PID 2160 wrote to memory of 4676	2160	cmd.exe	90
PID 2160 wrote to memory of 3660	2160	cmd.exe	91
PID 2160 wrote to memory of 3660	2160	cmd.exe	91
PID 2160 wrote to memory of 3384	2160	cmd.exe	98
PID 2160 wrote to memory of 3384	2160	cmd.exe	98
PID 2160 wrote to memory of 2928	2160	cmd.exe	99
PID 2160 wrote to memory of 2928	2160	cmd.exe	99
PID 2928 wrote to memory of 1584	2928	D5f0a5d17c7420fe49da676.exe	100
PID 2928 wrote to memory of 1584	2928	D5f0a5d17c7420fe49da676.exe	100
PID 2928 wrote to memory of 1312	2928	D5f0a5d17c7420fe49da676.exe	103
PID 2928 wrote to memory of 1312	2928	D5f0a5d17c7420fe49da676.exe	103

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-1-5-21-528036852-1341495193-1175965888-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	D5f0a5d17c7420fe49da676.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-528036852-1341495193-1175965888-1000\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⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4228
- 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:2160
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:4676
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:3660
- - 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:3384
- - C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe
    "C:\Users\Admin\AppData\Local\EsetSecurity\D5f0a5d17c7420fe49da676.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    - outlook_office_path
    - outlook_win_path
    PID:2928
  - - C:\Windows\System32\tar.exe
      "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp74E2.tmp" -C "C:\Users\Admin\AppData\Local\6rfb5r0uff"
      4⤵
      PID:1584
  - - C:\Users\Admin\AppData\Local\6rfb5r0uff\tor\tor.exe
      "C:\Users\Admin\AppData\Local\6rfb5r0uff\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\6rfb5r0uff\torrc.txt"
      4⤵
      Executes dropped EXE
      PID:1312

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

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Downloads

C:\Users\Admin\AppData\Local\6rfb5r0uff\data\cached-microdesc-consensus.tmp

Filesize
2.7MB

MD5
8f4baf1bd0a79cd74deae40a54208173

SHA1
4a3d378b958e3e7ab633f46bb97232813ad5e0ed

SHA256
b28e8d51120a7148ed0656c141667c5f9eff38f17288795a10ccf09b3edbc809

SHA512
fa37e67a2c66df6bd3d29599da2052bac69c9d27111e8055827bbb115204c50486b040d9709f45ffa3e64c0d449f52a16a57938624ca7677e3cbac3c8e06be8a

Download Submit
C:\Users\Admin\AppData\Local\6rfb5r0uff\data\cached-microdescs.new

Filesize
5.1MB

MD5
ad89ae35c19a209331f23d97766e36bf

SHA1
bb518b03d04149f9245f6a36679e0c7d0f70e341

SHA256
a11536ca31b12bda72e05a1caa1b65074ff3e5e3cfea491f05c48f0b368c8103

SHA512
dccae9396b1addd29b5d8001dc439f2295054fe3ddc54361d25ae0defc6a4503db9f28a25b162e6630f1e3da0b145956150480a04a4858c7ba8382ef737b5206

Download Submit
C:\Users\Admin\AppData\Local\6rfb5r0uff\host\hostname

Filesize
64B

MD5
776420d55191aa2f9671f422d0a9b618

SHA1
5bf9748fa31e3f1094d5569d62b3c2535e0388c1

SHA256
558b52222cb5441c37f5dd0d0cf5a525336e6fcc81bf14481b2c2041d4b4b845

SHA512
9dea846289914870e705b9631b2ec164e984f8d597e3411d632c0f625d7bf19ea8cb3cdb53880c4864f7c1038beecda0df41b7f751cc94504022061b7ea9338d

Download Submit
C:\Users\Admin\AppData\Local\6rfb5r0uff\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\6rfb5r0uff\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\6rfb5r0uff\torrc.txt

Filesize
218B

MD5
a1423896d1e53a4d60a2872773d9c589

SHA1
e0f70ed4e6d93c571eda9ed8e1204837311b3747

SHA256
14554a90c5f3ddaf04003f15a28b03c6480917d467a1b12f0402a244b3c0b71e

SHA512
fae2e598b4798524ec992bb5d642805de3e4050f61657426c3f212bfd5bc143f3ef7f7419deb58876e5525291dcee022d5b45e9880d534d21065257f1d5c6b50

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\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
fc1be6f3f52d5c841af91f8fc3f790cb

SHA1
ac79b4229e0a0ce378ae22fc6104748c5f234511

SHA256
6da862f7c7feffca99cd58712ece93928c6ca6aed617f5d8c10a4718eaa2a910

SHA512
2f46165017309ee1a0c1b23e30a71e52e86ad8933e2649bf58c3f4628c5aa75659f5b8f6be32c2882f220b2f3ff2fd50d8766bf0a3708c94c2c634c051a05ea6

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp74E2.tmp

Filesize
13.3MB

MD5
89d2d5811c1aff539bb355f15f3ddad0

SHA1
5bb3577c25b6d323d927200c48cd184a3e27c873

SHA256
b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

SHA512
39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

Download Submit
memory/2928-11-0x00007FF821C10000-0x00007FF8226D1000-memory.dmp

Filesize
10.8MB

Download
memory/2928-12-0x00000197A91F0000-0x00000197A9200000-memory.dmp

Filesize
64KB

Download
memory/2928-45-0x00007FF821C10000-0x00007FF8226D1000-memory.dmp

Filesize
10.8MB

Download
memory/2928-50-0x00000197A91F0000-0x00000197A9200000-memory.dmp

Filesize
64KB

Download
memory/4228-0-0x000001F251D50000-0x000001F251D94000-memory.dmp

Filesize
272KB

Download
memory/4228-6-0x00007FF822900000-0x00007FF8233C1000-memory.dmp

Filesize
10.8MB

Download
memory/4228-2-0x000001F252190000-0x000001F2521A0000-memory.dmp

Filesize
64KB

Download
memory/4228-1-0x00007FF822900000-0x00007FF8233C1000-memory.dmp

Filesize
10.8MB

Download