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
294s
max time network
303s
platform
windows11-21h2_x64
resource
win11-20240221-en
resource tags

arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-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

Executes dropped EXE 12 IoCs

pid	Process
4064	loader.exe
4520	tor.exe
1972	loader.exe
1504	tor.exe
2068	loader.exe
3884	tor.exe
2336	loader.exe
1648	tor.exe
4264	loader.exe
2484	tor.exe
1928	loader.exe
3436	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-1-5-21-3594324687-1993884830-4019639329-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe
Key opened	\REGISTRY\USER\S-1-5-21-3594324687-1993884830-4019639329-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe
Key opened	\REGISTRY\USER\S-1-5-21-3594324687-1993884830-4019639329-1000\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
29	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
1200	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
872	PING.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4064	loader.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	3220	loader.exe
Token: SeDebugPrivilege	4064	loader.exe
Token: SeDebugPrivilege	1972	loader.exe
Token: SeDebugPrivilege	2068	loader.exe
Token: SeDebugPrivilege	2336	loader.exe
Token: SeDebugPrivilege	4264	loader.exe
Token: SeDebugPrivilege	1928	loader.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 3220 wrote to memory of 4492	3220	loader.exe	78
PID 3220 wrote to memory of 4492	3220	loader.exe	78
PID 4492 wrote to memory of 4652	4492	cmd.exe	80
PID 4492 wrote to memory of 4652	4492	cmd.exe	80
PID 4492 wrote to memory of 872	4492	cmd.exe	81
PID 4492 wrote to memory of 872	4492	cmd.exe	81
PID 4492 wrote to memory of 1200	4492	cmd.exe	82
PID 4492 wrote to memory of 1200	4492	cmd.exe	82
PID 4492 wrote to memory of 4064	4492	cmd.exe	83
PID 4492 wrote to memory of 4064	4492	cmd.exe	83
PID 4064 wrote to memory of 900	4064	loader.exe	84
PID 4064 wrote to memory of 900	4064	loader.exe	84
PID 4064 wrote to memory of 4520	4064	loader.exe	86
PID 4064 wrote to memory of 4520	4064	loader.exe	86
PID 1972 wrote to memory of 1504	1972	loader.exe	90
PID 1972 wrote to memory of 1504	1972	loader.exe	90
PID 2068 wrote to memory of 3884	2068	loader.exe	96
PID 2068 wrote to memory of 3884	2068	loader.exe	96
PID 2336 wrote to memory of 1648	2336	loader.exe	101
PID 2336 wrote to memory of 1648	2336	loader.exe	101
PID 4264 wrote to memory of 2484	4264	loader.exe	106
PID 4264 wrote to memory of 2484	4264	loader.exe	106
PID 1928 wrote to memory of 3436	1928	loader.exe	111
PID 1928 wrote to memory of 3436	1928	loader.exe	111

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-1-5-21-3594324687-1993884830-4019639329-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	loader.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3594324687-1993884830-4019639329-1000\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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3220
- 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:4492
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:4652
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:872
- - 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:1200
- - C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
    "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"
    3⤵
    - 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:4064
  - - C:\Windows\System32\tar.exe
      "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp93A5.tmp" -C "C:\Users\Admin\AppData\Local\jjmzzxbvaf"
      4⤵
      PID:900
  - - 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:4520

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1972
- 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:1504

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2068
- 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:3884

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2336
- 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:1648

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4264
- 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:2484

C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1928
- 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:3436

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 50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d
MD5 486ebddc86ea8b3e965d390d22283a23
SHA1 eaffc047f067084867e8575c576a9ec60e094ba8
SHA512 0a50ba02250b38355a6f4fb94e40c61258a74031d9aea7cdf675f3e068f39ec0748ecf292aaf2f94b1963b9d66516ee79aa6c552617048e248774af0ff07189d
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

Submit Download

tmp93A5.tmp

Path C:\Users\Admin\AppData\Local\Temp\tmp93A5.tmp
Size 13.3MB
SHA256 b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12
MD5 89d2d5811c1aff539bb355f15f3ddad0
SHA1 5bb3577c25b6d323d927200c48cd184a3e27c873
SHA512 39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289
SSDEEP 393216:2YEKAkOvd2hKJDrq/OtTCRMTJqIdLZOBgfZn:XEJP2cJD2+GOJqMZOBGZn
MD5 SHA1 SHA512 SSDEEP

Submit Download

cached-microdesc-consensus

Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\data\cached-microdesc-consensus
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 11.2MB
SHA256 896f73dd42dc3c4a049b09baa4dd56f4262934f9420d4dddd8f7463e5e0d6b40
MD5 7501d59169f6c6aba88ac019311fda4b
SHA1 51d82fcd5dbebfb84ef46d192918a13d96e559b0
SHA512 310fa482b37fb6ca0d79e64f79cb629ed0a0bf700e3155028e4ae3683f04cfc4c22600c73b3c199b3f3a45bb6be7e0cf5cb1710a7c193914d3f56f10dc724590
SSDEEP 24576:SvoNEUtHB0+zwN1HAqU/rZk3X0hsawDX4Df5ET35T4QmFrw6hu0Gat252Ppj35hA:SkgQERyHQ
MD5 SHA1 SHA512 SSDEEP

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hostname

Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\host\hostname
Size 64B
SHA256 883ec19d4abf585c816e525fc39bd58442b5b91c6e7132f4a7665c294fc56677
MD5 3246ee17243b4c5fa4f83bed1ae7e9ad
SHA1 3416f1dd20a7fe3d7f9a117b6bd0a9cd428cc6db
SHA512 1e3d47eb57201c0fda84fcd6f2c1f2a732f7330dc40d3b427dfdd21cad58d07fb889d38e2844869c78c708e3ec2f0b105cfb7030ac1295cf0fb2bf51324c7c03
MD5 SHA1 SHA512

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port.dat

Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\port.dat
Size 4B
SHA256 72a1917673994c23e72b3f49c2134549aa2219dffd8c029a071efe9c437f7888
MD5 e113bb92c69391dd39e2488f9f588382
SHA1 8b32237f6906db4dafcf1f046dbce2cfe9ea3f21
SHA512 252586573661ee1c495f5f91158a3fb4fad5aa8a8e38941cf95b932cb1ffb9122b806d16646ddfdec6dc9ce8b80bb8740e5018508c555236255a4907362465fb
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 bac2153b4af54214c9b05e297297a8e8bd09f2b0723108e0817b4b5bfbc94008
MD5 c46943b92ed14d07c1ab5bff91b8b2c1
SHA1 85ceb3d10af26786fb7f5274cf611d1910a0d84d
SHA512 0fd723401e6913e26e3567f242331e58dbcc8a624798d6ae5918052d58eca07abad51b9ab3c8545cab0d201b0895215268f11ec2175738e0a4378b77f6945e10
MD5 SHA1 SHA512

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memory/1928-148-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/1928-151-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/1928-149-0x00000204648B0000-0x00000204648C0000-memory.dmp

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memory/1972-80-0x00000246CD440000-0x00000246CD450000-memory.dmp

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memory/1972-83-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/1972-79-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/2068-100-0x0000019850900000-0x0000019850910000-memory.dmp

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memory/2068-102-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/2068-99-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/2336-114-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/2336-115-0x0000025552930000-0x0000025552940000-memory.dmp

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memory/2336-117-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/3220-1-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/3220-2-0x000001DA554F0000-0x000001DA55500000-memory.dmp

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memory/3220-6-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/3220-0-0x000001DA54FA0000-0x000001DA55008000-memory.dmp

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memory/4064-12-0x00000235444C0000-0x00000235444D0000-memory.dmp

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memory/4064-11-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/4064-60-0x00000235444C0000-0x00000235444D0000-memory.dmp

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memory/4064-48-0x0000023544BD0000-0x0000023544D83000-memory.dmp

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memory/4064-58-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/4264-129-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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memory/4264-130-0x000001BE52F10000-0x000001BE52F20000-memory.dmp

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memory/4264-132-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

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