gurcu | 2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93

Analysis

max time kernel
148s
max time network
155s
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 05:54

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General

Target

I63f8affb2294c837814c33f5446924ba.exe
Size

89KB
MD5

dfb3936eb972928af9ec106505364786
SHA1

06a05bf8d2675ea58e44d3fdc0d9e610be021ca8
SHA256

2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93
SHA512

e71c24d1804792be45281e70e97d909817e18d0948dcaf86b3e49d22d9f085278b8d043613f1fee0468a28f9e10218ac2cce3315e4c1575f242b324f606e950f
SSDEEP

1536:/JVNAuC4/P1xAqm9wRC+IWMVYJGOupb1cus6SQsjhp5cNbMQaZ9bqk4gxmsuZmQ+:fN//HAqm9wRC+IWMVYJGOubXsjL5wvsD

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 3 IoCs

resource	yara_rule
behavioral2/memory/3104-0-0x0000027783A40000-0x0000027783A5C000-memory.dmp	family_gurcu_v3
behavioral2/files/0x0007000000023283-8.dat	family_gurcu_v3
behavioral2/files/0x0007000000023283-9.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-1-5-21-1980726966-773384374-2129981223-1000\Control Panel\International\Geo\Nation	I63f8affb2294c837814c33f5446924ba.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1980726966-773384374-2129981223-1000\Control Panel\International\Geo\Nation	I63f8affb2294c837814c33f5446924ba.exe

Executes dropped EXE 2 IoCs

pid	Process
1504	I63f8affb2294c837814c33f5446924ba.exe
2176	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-1-5-21-1980726966-773384374-2129981223-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	I63f8affb2294c837814c33f5446924ba.exe
Key opened	\REGISTRY\USER\S-1-5-21-1980726966-773384374-2129981223-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	I63f8affb2294c837814c33f5446924ba.exe
Key opened	\REGISTRY\USER\S-1-5-21-1980726966-773384374-2129981223-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	I63f8affb2294c837814c33f5446924ba.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
35	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
4528	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1988	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1504	I63f8affb2294c837814c33f5446924ba.exe
1504	I63f8affb2294c837814c33f5446924ba.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3104	I63f8affb2294c837814c33f5446924ba.exe
Token: SeDebugPrivilege	1504	I63f8affb2294c837814c33f5446924ba.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3104 wrote to memory of 3420	3104	I63f8affb2294c837814c33f5446924ba.exe	87
PID 3104 wrote to memory of 3420	3104	I63f8affb2294c837814c33f5446924ba.exe	87
PID 3420 wrote to memory of 1304	3420	cmd.exe	89
PID 3420 wrote to memory of 1304	3420	cmd.exe	89
PID 3420 wrote to memory of 1988	3420	cmd.exe	90
PID 3420 wrote to memory of 1988	3420	cmd.exe	90
PID 3420 wrote to memory of 4528	3420	cmd.exe	93
PID 3420 wrote to memory of 4528	3420	cmd.exe	93
PID 3420 wrote to memory of 1504	3420	cmd.exe	94
PID 3420 wrote to memory of 1504	3420	cmd.exe	94
PID 1504 wrote to memory of 2480	1504	I63f8affb2294c837814c33f5446924ba.exe	98
PID 1504 wrote to memory of 2480	1504	I63f8affb2294c837814c33f5446924ba.exe	98
PID 1504 wrote to memory of 2176	1504	I63f8affb2294c837814c33f5446924ba.exe	100
PID 1504 wrote to memory of 2176	1504	I63f8affb2294c837814c33f5446924ba.exe	100

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-1-5-21-1980726966-773384374-2129981223-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	I63f8affb2294c837814c33f5446924ba.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1980726966-773384374-2129981223-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	I63f8affb2294c837814c33f5446924ba.exe

C:\Users\Admin\AppData\Local\Temp\I63f8affb2294c837814c33f5446924ba.exe
"C:\Users\Admin\AppData\Local\Temp\I63f8affb2294c837814c33f5446924ba.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3104
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "I63f8affb2294c837814c33f5446924ba" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\I63f8affb2294c837814c33f5446924ba.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3420
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:1304
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:1988
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "I63f8affb2294c837814c33f5446924ba" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:4528
- - C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe
    "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.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:1504
  - - C:\Windows\System32\tar.exe
      "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmpFCFD.tmp" -C "C:\Users\Admin\AppData\Local\jdm9hu6p1h"
      4⤵
      PID:2480
  - - C:\Users\Admin\AppData\Local\jdm9hu6p1h\tor\tor.exe
      "C:\Users\Admin\AppData\Local\jdm9hu6p1h\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jdm9hu6p1h\torrc.txt"
      4⤵
      Executes dropped EXE
      PID:2176

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\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe

Filesize
89KB

MD5
dfb3936eb972928af9ec106505364786

SHA1
06a05bf8d2675ea58e44d3fdc0d9e610be021ca8

SHA256
2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93

SHA512
e71c24d1804792be45281e70e97d909817e18d0948dcaf86b3e49d22d9f085278b8d043613f1fee0468a28f9e10218ac2cce3315e4c1575f242b324f606e950f

Download Submit
C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe

Filesize
89KB

MD5
dfb3936eb972928af9ec106505364786

SHA1
06a05bf8d2675ea58e44d3fdc0d9e610be021ca8

SHA256
2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93

SHA512
e71c24d1804792be45281e70e97d909817e18d0948dcaf86b3e49d22d9f085278b8d043613f1fee0468a28f9e10218ac2cce3315e4c1575f242b324f606e950f

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\I63f8affb2294c837814c33f5446924ba.exe.log

Filesize
1KB

MD5
fc1be6f3f52d5c841af91f8fc3f790cb

SHA1
ac79b4229e0a0ce378ae22fc6104748c5f234511

SHA256
6da862f7c7feffca99cd58712ece93928c6ca6aed617f5d8c10a4718eaa2a910

SHA512
2f46165017309ee1a0c1b23e30a71e52e86ad8933e2649bf58c3f4628c5aa75659f5b8f6be32c2882f220b2f3ff2fd50d8766bf0a3708c94c2c634c051a05ea6

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

Filesize
13.3MB

MD5
89d2d5811c1aff539bb355f15f3ddad0

SHA1
5bb3577c25b6d323d927200c48cd184a3e27c873

SHA256
b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

SHA512
39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

Download Submit
C:\Users\Admin\AppData\Local\jdm9hu6p1h\data\cached-microdesc-consensus.tmp

Filesize
2.7MB

MD5
c8eab448f2d958af2f5b8b13a07b1df5

SHA1
be084aed25bc28de101f9a74fdbb1f9fc6293ec6

SHA256
89345602270280980ec8c07f08b0feb2499072f102af1a9b7b3f61b10ab0e468

SHA512
7dfb251edd5ba0167b29d9a33411e353d5e0d7104eca4a1b7621fe5e3f723d9e9e9391ac1906e582dc254693295231d6c27c678af728873c928da7a5facaac93

Download Submit
C:\Users\Admin\AppData\Local\jdm9hu6p1h\data\cached-microdescs.new

Filesize
6.4MB

MD5
ec369b59d6ec153b451a65fc9b12db4e

SHA1
d34881f9fde23e7dfc2666ffd1821be729fbbd4e

SHA256
f4f9a17e8f0c90864916b51621b27af90654bcac17984eeb757e978b766cacd0

SHA512
f578775f0eea2391711c8c98a891079c2396b29300a110e33ffba911d9442e4ba803a283033594b9456e6986c6dd5cd0016e40ce13435cf6730ac2088b7d72f7

Download Submit
C:\Users\Admin\AppData\Local\jdm9hu6p1h\host\hostname

Filesize
64B

MD5
540adcf35dea5b5f839e1a076f288be7

SHA1
f5eb5e41d942780ef1db4373ab8950b72a3145a9

SHA256
3262bbcc065509953da2c1a65b30d045d41686f354c6f6e9b997a0748edfe8b6

SHA512
e8c232051eea2d71994cfcfaaa4607c07ea81612f77601ca0fad1e7f122a66e00c1be5c29bae9e0717f688dfbceb59b30cc92b793e49bdae8c453a438864d828

Download Submit
C:\Users\Admin\AppData\Local\jdm9hu6p1h\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\jdm9hu6p1h\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\jdm9hu6p1h\torrc.txt

Filesize
218B

MD5
45141efbaeabc9241ff81da062f50ddd

SHA1
2c73309a2ab508a83f8d3b905d125cd5d986eb3d

SHA256
de6724f5e4037654a7434ed02ccaa77c211a2ab2b2df3e0df1da9e735c9ffbaa

SHA512
720f86f62edba43abc996eb1d65c39e56219b49fa55924f7cb1c304836e53a8ea91f9d55ef6d834bd1a34f6b8576a43fd2e916d179d9e5da1d4fc5fbebb1075f

Download Submit
memory/1504-12-0x000001F8B06B0000-0x000001F8B06C0000-memory.dmp

Filesize
64KB

Download
memory/1504-11-0x00007FF850C00000-0x00007FF8516C1000-memory.dmp

Filesize
10.8MB

Download
memory/1504-45-0x00007FF850C00000-0x00007FF8516C1000-memory.dmp

Filesize
10.8MB

Download
memory/1504-51-0x000001F8B06B0000-0x000001F8B06C0000-memory.dmp

Filesize
64KB

Download
memory/3104-0-0x0000027783A40000-0x0000027783A5C000-memory.dmp

Filesize
112KB

Download
memory/3104-6-0x00007FF8514D0000-0x00007FF851F91000-memory.dmp

Filesize
10.8MB

Download
memory/3104-2-0x00000277840D0000-0x00000277840E0000-memory.dmp

Filesize
64KB

Download
memory/3104-1-0x00007FF8514D0000-0x00007FF851F91000-memory.dmp

Filesize
10.8MB

Download