gurcu | 8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3

Resubmissions

10/04/2024, 02:58

240410-dgn9kacd4610

10/04/2024, 02:58

10/04/2024, 02:58

10/04/2024, 02:58

23/08/2023, 14:58

Analysis

max time kernel
289s
max time network
303s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
10/04/2024, 02:58

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General

Target
loader.exe
Size 401KB
Sample240410-dgm2haff7v
SHA256 8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3
MD5 69e3cdc923b668aec4cb405c040565c6
SHA1 6a675ebf6f241e543f7bb50ccc8ead462a427880
SHA512 5580919f6710fc210f079875eae22a87c85e854b57f59d10fc22680460f370154d7d223a66c9797387e4675a7954ba6f051a34571499481927980eb9ebf07cdb
SSDEEP 6144:+CGmWI/2hvRn6Ie646G0D1eBlxy9bAmI6:+KWI/8B6Q9b5eBlxnmI6
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

gurcu collection spyware stealer

Malware Config

Extracted

Family

gurcu

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

Signatures

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

Checks computer location settings 2 TTPs 7 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-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	loader.exe
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	loader.exe
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	loader.exe
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	loader.exe
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	loader.exe
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	loader.exe
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	loader.exe

Executes dropped EXE 12 IoCs

pid	Process
3788	loader.exe
4392	tor.exe
4180	loader.exe
4652	tor.exe
4896	loader.exe
1344	tor.exe
1736	loader.exe
4004	tor.exe
1088	loader.exe
3956	tor.exe
984	loader.exe
4852	tor.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 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe
Key opened	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe
Key opened	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.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
70	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
2884	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3264	PING.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
3788	loader.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	5056	loader.exe
Token: SeDebugPrivilege	3788	loader.exe
Token: SeDebugPrivilege	4180	loader.exe
Token: SeDebugPrivilege	4896	loader.exe
Token: SeDebugPrivilege	1736	loader.exe
Token: SeDebugPrivilege	1088	loader.exe
Token: SeDebugPrivilege	984	loader.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 5056 wrote to memory of 756	5056	loader.exe	85
PID 5056 wrote to memory of 756	5056	loader.exe	85
PID 756 wrote to memory of 2224	756	cmd.exe	87
PID 756 wrote to memory of 2224	756	cmd.exe	87
PID 756 wrote to memory of 3264	756	cmd.exe	88
PID 756 wrote to memory of 3264	756	cmd.exe	88
PID 756 wrote to memory of 2884	756	cmd.exe	93
PID 756 wrote to memory of 2884	756	cmd.exe	93
PID 756 wrote to memory of 3788	756	cmd.exe	94
PID 756 wrote to memory of 3788	756	cmd.exe	94
PID 3788 wrote to memory of 4868	3788	loader.exe	99
PID 3788 wrote to memory of 4868	3788	loader.exe	99
PID 3788 wrote to memory of 4392	3788	loader.exe	101
PID 3788 wrote to memory of 4392	3788	loader.exe	101
PID 4180 wrote to memory of 4652	4180	loader.exe	108
PID 4180 wrote to memory of 4652	4180	loader.exe	108
PID 4896 wrote to memory of 1344	4896	loader.exe	114
PID 4896 wrote to memory of 1344	4896	loader.exe	114
PID 1736 wrote to memory of 4004	1736	loader.exe	119
PID 1736 wrote to memory of 4004	1736	loader.exe	119
PID 1088 wrote to memory of 3956	1088	loader.exe	124
PID 1088 wrote to memory of 3956	1088	loader.exe	124
PID 984 wrote to memory of 4852	984	loader.exe	129
PID 984 wrote to memory of 4852	984	loader.exe	129

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-1-5-21-566096764-1992588923-1249862864-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe

C:\Users\Admin\AppData\Local\Temp\loader.exe
"C:\Users\Admin\AppData\Local\Temp\loader.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5056
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\loader.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:756
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2224
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:3264
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2884
- - C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
    "C:\Users\Admin\AppData\Local\TeamViewer\loader.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:3788
  - - C:\Windows\System32\tar.exe
      "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp3EFD.tmp" -C "C:\Users\Admin\AppData\Local\jjmzzxbvaf"
      4⤵
      PID:4868
  - - C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
      "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
      4⤵
      Executes dropped EXE
      PID:4392

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4180
- C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
  "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
  2⤵
  - Executes dropped EXE
  PID:4652

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4896
- C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
  "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
  2⤵
  - Executes dropped EXE
  PID:1344

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1736
- C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
  "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
  2⤵
  - Executes dropped EXE
  PID:4004

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1088
- C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
  "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
  2⤵
  - Executes dropped EXE
  PID:3956

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:984
- C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
  "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
  2⤵
  - Executes dropped EXE
  PID:4852

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

Credentials in Registry

T1552.002

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

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Downloads

loader.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\loader.exe.log
Size 847B
SHA256 169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e
MD5 3308a84a40841fab7dfec198b3c31af7
SHA1 4e7ab6336c0538be5dd7da529c0265b3b6523083
SHA512 97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198
MD5 SHA1 SHA512

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loader.exe

Path C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
Size 401KB
SHA256 8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3
MD5 69e3cdc923b668aec4cb405c040565c6
SHA1 6a675ebf6f241e543f7bb50ccc8ead462a427880
SHA512 5580919f6710fc210f079875eae22a87c85e854b57f59d10fc22680460f370154d7d223a66c9797387e4675a7954ba6f051a34571499481927980eb9ebf07cdb
SSDEEP 6144:+CGmWI/2hvRn6Ie646G0D1eBlxy9bAmI6:+KWI/8B6Q9b5eBlxnmI6
MD5 SHA1 SHA512 SSDEEP

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tmp3EFD.tmp

Path C:\Users\Admin\AppData\Local\Temp\tmp3EFD.tmp
Size 13.3MB
SHA256 b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12
MD5 89d2d5811c1aff539bb355f15f3ddad0
SHA1 5bb3577c25b6d323d927200c48cd184a3e27c873
SHA512 39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289
SSDEEP 393216:2YEKAkOvd2hKJDrq/OtTCRMTJqIdLZOBgfZn:XEJP2cJD2+GOJqMZOBGZn
MD5 SHA1 SHA512 SSDEEP

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cached-certs

Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\data\cached-certs
Size 18KB
SHA256 3820fb93f84dfcd0444cba3fa78977fe5b93b228c30d86b951efa6c399af58c5
MD5 77e3e08e7fa056330445d5652b83cf13
SHA1 11f79ac48bd0d8f19d6ac5c6175f22b9c2a73c30
SHA512 db33f59495671e84cb07cc45e0da6822c522c00434d85c7b4a91e7e4016850a0db1023180e1ca8f817858e23f1ff6bd3433e69e85ad5caae19c9ca58086b4eb2
SSDEEP 384:jd24VdzVH591hFsNl2h4YVc1h1tMY4QkV6icO1hMtqzd4ReWVVNX1hPt1thO4eG6:R26ZJQl6xyhRBkoicOaq5Ie+PXjnjO1r
MD5 SHA1 SHA512 SSDEEP

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cached-microdesc-consensus.tmp

Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\data\cached-microdesc-consensus.tmp
Size 2.7MB
SHA256 60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3
MD5 a0db8a87f7b723266c8b04255da46b06
SHA1 4df00ea56d22d88f3d2e005ef66bad5b3ef92ebf
SHA512 41b8fc467d11af7ca6a42c7e94d1b8295ab3ae5d6d186b4f378e6e079440520e8324b695da1134beb2bc1697d2491edcc70c1b75ab6fc66b9c1cb2ecbcdb4a7d
SSDEEP 12288:v8nySbLlrTqASpoC6J9gRbMVwvKZq2gbIIuXM6h4Uviymjo09LQQ:vMxBSu+1MpKR6l6yMQQ
MD5 SHA1 SHA512 SSDEEP

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cached-microdescs.new

Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\data\cached-microdescs.new
Size 7.8MB
SHA256 828e887ac48f5d631d6c00ccffecaa86339849f6e50c7ef1bf5f0dfdbc36d77b
MD5 d9dff6e35782c14ab85149cdb363d164
SHA1 f1339390f7ef9d89a32224586e03e10d136d6d44
SHA512 8a94dfcb5a10b3d4930f12d0d453f319d2b8975931363f76a8ba1a74cbdfb120527270778bdd3c661ef5105512e683e970e958d0e27d179e3c3c7aef98ec54c8
SSDEEP 24576:7QZXzLJZyAXVwC+Q+bNJdy+J3OgiEIaORPDq6WYFm1pNCx4rXWqFFLqWW2+hiQor:tyQ1K2DQBKf
MD5 SHA1 SHA512 SSDEEP

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hostname

Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\host\hostname
Size 64B
SHA256 556d564a800365504a9e9eea7a07235398ba4d61c028658239d72d78a71bcace
MD5 9deb8cbfbaf2d144303435bd22357399
SHA1 288e275ebc64b0d385a8ce7005187e409a051d59
SHA512 ad67af6e3f4113ed4520032e4b5280b346e9dcc76567d8cfe20267ccc08dfc5342882566ceb09d7c7fee581e18814f7bf3140af3addba26b958d4b234298e8ff
MD5 SHA1 SHA512

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port.dat

Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\port.dat
Size 4B
SHA256 4dca6e902ba3d8cae51d1bb7746494ac21eee2580bba42e082cf16cb15da3951
MD5 3bcf6eecb2611212e088d0d91f2ade9c
SHA1 aa1b6ac9b1d786185812a278b76b31730604dfe8
SHA512 db445b27ec1aa150a21abdfe3a576b5d5226d590b45d583582810049a9721c05128f0c1127dc25f301b0e2544b1cc17d8061617b9d05b1a52f236d0922ab4341
MD5 SHA1 SHA512

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tor.exe

Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
Size 7.4MB
SHA256 46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82
MD5 88590909765350c0d70c6c34b1f31dd2
SHA1 129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7
SHA512 a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192
SSDEEP 98304:3iPgwPv8LqpP5ZkfiSMdm+KHMU2O1R0fzwkEOlcHA6IZGQ:VbM8jjX1R0R6YL
MD5 SHA1 SHA512 SSDEEP

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torrc.txt

Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt
Size 218B
SHA256 437e53c6d56b5cdf7c62af87bb93e7ab42a948a0458adcf72aa41990d625af58
MD5 1482f15999856f78ae11194f77443dcf
SHA1 cd5d3dfaecbd1fdae222b1755f865ae82a57d733
SHA512 f3c5431bfbdff37b381bd359b50851e6f717fcbf64b03fa23695333960325a24994c58276ae2685d99b1ca09bb04ff6b99c96bb407417d042bbce7e45f4956af
MD5 SHA1 SHA512

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memory/984-118-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/984-116-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/1088-106-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/1088-103-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/1088-104-0x00000269A66B0000-0x00000269A66C0000-memory.dmp

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memory/1736-98-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/1736-99-0x00000133A5FA0000-0x00000133A5FB0000-memory.dmp

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memory/1736-101-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/3788-11-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/3788-12-0x000002807CD50000-0x000002807CD60000-memory.dmp

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memory/3788-58-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/3788-68-0x000002807CD50000-0x000002807CD60000-memory.dmp

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memory/4180-83-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/4180-80-0x00000270A9BF0000-0x00000270A9C00000-memory.dmp

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memory/4180-79-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/4896-96-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/4896-94-0x0000029B535C0000-0x0000029B535D0000-memory.dmp

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memory/4896-93-0x00007FFF750A0000-0x00007FFF75B61000-memory.dmp

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memory/5056-0-0x0000017A4F4D0000-0x0000017A4F538000-memory.dmp

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memory/5056-6-0x00007FFF76A40000-0x00007FFF77501000-memory.dmp

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memory/5056-2-0x0000017A69A40000-0x0000017A69A50000-memory.dmp

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memory/5056-1-0x00007FFF76A40000-0x00007FFF77501000-memory.dmp

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