gurcu | 2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93

Resubmissions

10-04-2024 02:45

240410-c88xlscb89 10

10-04-2024 02:45

10-04-2024 02:45

10-04-2024 02:45

14-10-2023 02:07

Analysis

max time kernel
110s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
14-10-2023 02:07

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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 5 IoCs

resource	yara_rule
behavioral2/memory/3096-0-0x0000021EEFF70000-0x0000021EEFF8C000-memory.dmp	family_gurcu_v3
behavioral2/files/0x000700000002323f-8.dat	family_gurcu_v3
behavioral2/files/0x000700000002323f-9.dat	family_gurcu_v3
behavioral2/memory/408-12-0x000001B21CA90000-0x000001B21CAA0000-memory.dmp	family_gurcu_v3
behavioral2/files/0x000700000002323f-75.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-1-5-21-1926387074-3400613176-3566796709-1000\Control Panel\International\Geo\Nation	I63f8affb2294c837814c33f5446924ba.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1926387074-3400613176-3566796709-1000\Control Panel\International\Geo\Nation	I63f8affb2294c837814c33f5446924ba.exe

Executes dropped EXE 3 IoCs

pid	Process
408	I63f8affb2294c837814c33f5446924ba.exe
3356	tor.exe
2496	I63f8affb2294c837814c33f5446924ba.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-1-5-21-1926387074-3400613176-3566796709-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	I63f8affb2294c837814c33f5446924ba.exe
Key opened	\REGISTRY\USER\S-1-5-21-1926387074-3400613176-3566796709-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	I63f8affb2294c837814c33f5446924ba.exe
Key opened	\REGISTRY\USER\S-1-5-21-1926387074-3400613176-3566796709-1000\Software\Microsoft\Office\16.0\Outlook\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
30	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
2260	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4356	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
408	I63f8affb2294c837814c33f5446924ba.exe
408	I63f8affb2294c837814c33f5446924ba.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3096	I63f8affb2294c837814c33f5446924ba.exe
Token: SeDebugPrivilege	408	I63f8affb2294c837814c33f5446924ba.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3096 wrote to memory of 1884	3096	I63f8affb2294c837814c33f5446924ba.exe	85
PID 3096 wrote to memory of 1884	3096	I63f8affb2294c837814c33f5446924ba.exe	85
PID 1884 wrote to memory of 5068	1884	cmd.exe	87
PID 1884 wrote to memory of 5068	1884	cmd.exe	87
PID 1884 wrote to memory of 4356	1884	cmd.exe	88
PID 1884 wrote to memory of 4356	1884	cmd.exe	88
PID 1884 wrote to memory of 2260	1884	cmd.exe	90
PID 1884 wrote to memory of 2260	1884	cmd.exe	90
PID 1884 wrote to memory of 408	1884	cmd.exe	91
PID 1884 wrote to memory of 408	1884	cmd.exe	91
PID 408 wrote to memory of 2824	408	I63f8affb2294c837814c33f5446924ba.exe	94
PID 408 wrote to memory of 2824	408	I63f8affb2294c837814c33f5446924ba.exe	94
PID 408 wrote to memory of 3356	408	I63f8affb2294c837814c33f5446924ba.exe	97
PID 408 wrote to memory of 3356	408	I63f8affb2294c837814c33f5446924ba.exe	97

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-1-5-21-1926387074-3400613176-3566796709-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	I63f8affb2294c837814c33f5446924ba.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1926387074-3400613176-3566796709-1000\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:3096
- 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:1884
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:5068
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:4356
- - 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:2260
- - 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:408
  - - C:\Windows\System32\tar.exe
      "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmpD02C.tmp" -C "C:\Users\Admin\AppData\Local\jdm9hu6p1h"
      4⤵
      PID:2824
  - - 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:3356

C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe
C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe
1⤵
- Executes dropped EXE
PID:2496

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\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\tmpD02C.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
557271a589ebea1ba0d668ed7e0fe327

SHA1
5d6a827f099feeac24e6ff79fae37e574579d414

SHA256
7a2dc8a121e7b41a032c031fb8076f13979847195a4207377de87a52a936f9bd

SHA512
f2e4a1bf4a2b6ce047b627e13c0ceaf1df36a7c65070675d835589da2ea68dc99f50d70a527de821427eb61f59b37b80fcdad5378d2b990f8db5528cc7191453

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

Filesize
7.7MB

MD5
d36e756571221db7fa3e0d8c57597309

SHA1
906e572cb9b2c62dd6d791d904681a27a8189df1

SHA256
1df6d73d06bba796aebe16461c154c0690b332b2132513316b359639d826298a

SHA512
63cbe5f0918ddc3c4f2b5a5708c26d9b43b0443e9de83176941a27d52892823c747a8d875287e10cd674c781bf8aa75c2bda1e14cc162db6834481b79f074d47

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

Filesize
64B

MD5
00c389db7f8f73bc64ffb0e74d081057

SHA1
ec568ae1ad46d19863d7d6d4f0ddb1bc3a150b51

SHA256
25df1180ef8cd2651ae5d4a02863dccc48afc3f351d3829c941089f864ad1e5f

SHA512
cb2cc4cb6735ea652dd9dbc5660337be52636a3b586a7ae4d6ec50129c13f658a98901fe8e5b576fe7f04874743032a5940e6aab9ab51b80c62fe172cf5f3697

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
0c757b2af26c2a5c407e95127e005e72

SHA1
233f794952988b392fce7f3089d95bf77f6a4a64

SHA256
1ec1270ee5732911a16237733a617634b671c8d4873f89cdfd69006c3c78e766

SHA512
12e8f6343db44e332d0e66d9382cae5ded58272d382e1f6cf2429cc027e9c6545e0520e296f7bfc271c7cc52936a2d45bf66fd6d64f0ba3c45b86c0c58d91e29

Download Submit
memory/408-14-0x00007FFE36460000-0x00007FFE36F21000-memory.dmp

Filesize
10.8MB

Download
memory/408-15-0x000001B21CA90000-0x000001B21CAA0000-memory.dmp

Filesize
64KB

Download
memory/408-12-0x000001B21CA90000-0x000001B21CAA0000-memory.dmp

Filesize
64KB

Download
memory/408-11-0x00007FFE36460000-0x00007FFE36F21000-memory.dmp

Filesize
10.8MB

Download
memory/3096-0-0x0000021EEFF70000-0x0000021EEFF8C000-memory.dmp

Filesize
112KB

Download
memory/3096-6-0x00007FFE36EF0000-0x00007FFE379B1000-memory.dmp

Filesize
10.8MB

Download
memory/3096-2-0x0000021EF0330000-0x0000021EF0340000-memory.dmp

Filesize
64KB

Download
memory/3096-1-0x00007FFE36EF0000-0x00007FFE379B1000-memory.dmp

Filesize
10.8MB

Download