gurcu | 0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5

Analysis

max time kernel
114s
max time network
127s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
14/10/2023, 03:47

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General

Target
Vfd663501e1ac13eb331505b8388e675450.exe
Size 121KB
Sample231014-eb6r4aef4z
SHA256 0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5
MD5 35625d89730f70f12ecdeaf795722865
SHA1 0fedcad5039e3317d0e434bb038b81850e8f3599
SHA512 edef804d22bf09d6eb3dfa397fb8ca609967a4af77db0cbb79aafee1510cd7f0a6087f7b66316592b14bff775df20b0877a58c9ee14fbe77a91171a7559fb301
SSDEEP 3072:qQ2NGg7V7MOrwPRT3KhM9bFcLyoDtfXtRW5FhpAB0H/aAz:aGmg9bFc/p25FJa
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

gurcu collection spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 4 IoCs

resource	yara_rule
behavioral2/memory/2580-0-0x00000215DCD60000-0x00000215DCD84000-memory.dmp	family_gurcu_v3
behavioral2/files/0x00060000000231db-8.dat	family_gurcu_v3
behavioral2/files/0x00060000000231db-9.dat	family_gurcu_v3
behavioral2/files/0x00060000000231db-14.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-1-5-21-1045988481-1457812719-2617974652-1000\Control Panel\International\Geo\Nation	Vfd663501e1ac13eb331505b8388e675450.exe

Executes dropped EXE 1 IoCs

pid	Process
408	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 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1045988481-1457812719-2617974652-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe
Key opened	\REGISTRY\USER\S-1-5-21-1045988481-1457812719-2617974652-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe
Key opened	\REGISTRY\USER\S-1-5-21-1045988481-1457812719-2617974652-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe

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
4552	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4724	PING.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
408	Vfd663501e1ac13eb331505b8388e675450.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2580	Vfd663501e1ac13eb331505b8388e675450.exe
Token: SeDebugPrivilege	408	Vfd663501e1ac13eb331505b8388e675450.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 2580 wrote to memory of 4368	2580	Vfd663501e1ac13eb331505b8388e675450.exe	84
PID 2580 wrote to memory of 4368	2580	Vfd663501e1ac13eb331505b8388e675450.exe	84
PID 4368 wrote to memory of 2268	4368	cmd.exe	86
PID 4368 wrote to memory of 2268	4368	cmd.exe	86
PID 4368 wrote to memory of 4724	4368	cmd.exe	89
PID 4368 wrote to memory of 4724	4368	cmd.exe	89
PID 4368 wrote to memory of 4552	4368	cmd.exe	91
PID 4368 wrote to memory of 4552	4368	cmd.exe	91
PID 4368 wrote to memory of 408	4368	cmd.exe	92
PID 4368 wrote to memory of 408	4368	cmd.exe	92
PID 408 wrote to memory of 5096	408	Vfd663501e1ac13eb331505b8388e675450.exe	93
PID 408 wrote to memory of 5096	408	Vfd663501e1ac13eb331505b8388e675450.exe	93
PID 5096 wrote to memory of 2628	5096	cmd.exe	95
PID 5096 wrote to memory of 2628	5096	cmd.exe	95
PID 5096 wrote to memory of 3432	5096	cmd.exe	96
PID 5096 wrote to memory of 3432	5096	cmd.exe	96
PID 5096 wrote to memory of 3212	5096	cmd.exe	97
PID 5096 wrote to memory of 3212	5096	cmd.exe	97
PID 408 wrote to memory of 3688	408	Vfd663501e1ac13eb331505b8388e675450.exe	100
PID 408 wrote to memory of 3688	408	Vfd663501e1ac13eb331505b8388e675450.exe	100
PID 3688 wrote to memory of 4952	3688	cmd.exe	102
PID 3688 wrote to memory of 4952	3688	cmd.exe	102
PID 3688 wrote to memory of 4940	3688	cmd.exe	103
PID 3688 wrote to memory of 4940	3688	cmd.exe	103
PID 3688 wrote to memory of 5084	3688	cmd.exe	104
PID 3688 wrote to memory of 5084	3688	cmd.exe	104

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-1-5-21-1045988481-1457812719-2617974652-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Vfd663501e1ac13eb331505b8388e675450.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1045988481-1457812719-2617974652-1000\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:2580
- 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:4368
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2268
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:4724
- - 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:4552
- - 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
    - outlook_office_path
    - outlook_win_path
    PID:408
  - - C:\Windows\SYSTEM32\cmd.exe
      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:5096
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:2628
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show profiles
        5⤵
        
        PID:3432
    - - C:\Windows\system32\findstr.exe
        
        findstr /R /C:"[ ]:[ ]"
        5⤵
        
        PID:3212
  - - 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:3688
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:4952
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show networks mode=bssid
        5⤵
        
        PID:4940
    - - C:\Windows\system32\findstr.exe
        
        findstr "SSID BSSID Signal"
        5⤵
        
        PID:5084

C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
1⤵
PID:2548

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

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Downloads

Vfd663501e1ac13eb331505b8388e675450.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Vfd663501e1ac13eb331505b8388e675450.exe.log
Size 847B
SHA256 169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e
MD5 3308a84a40841fab7dfec198b3c31af7
SHA1 4e7ab6336c0538be5dd7da529c0265b3b6523083
SHA512 97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198
MD5 SHA1 SHA512

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Vfd663501e1ac13eb331505b8388e675450.exe

Path C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
Size 121KB
SHA256 0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5
MD5 35625d89730f70f12ecdeaf795722865
SHA1 0fedcad5039e3317d0e434bb038b81850e8f3599
SHA512 edef804d22bf09d6eb3dfa397fb8ca609967a4af77db0cbb79aafee1510cd7f0a6087f7b66316592b14bff775df20b0877a58c9ee14fbe77a91171a7559fb301
SSDEEP 3072:qQ2NGg7V7MOrwPRT3KhM9bFcLyoDtfXtRW5FhpAB0H/aAz:aGmg9bFc/p25FJa
MD5 SHA1 SHA512 SSDEEP

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Vfd663501e1ac13eb331505b8388e675450.exe

Path C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
Size 121KB
SHA256 0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5
MD5 35625d89730f70f12ecdeaf795722865
SHA1 0fedcad5039e3317d0e434bb038b81850e8f3599
SHA512 edef804d22bf09d6eb3dfa397fb8ca609967a4af77db0cbb79aafee1510cd7f0a6087f7b66316592b14bff775df20b0877a58c9ee14fbe77a91171a7559fb301
SSDEEP 3072:qQ2NGg7V7MOrwPRT3KhM9bFcLyoDtfXtRW5FhpAB0H/aAz:aGmg9bFc/p25FJa
MD5 SHA1 SHA512 SSDEEP

Submit Download

Vfd663501e1ac13eb331505b8388e675450.exe

Path C:\Users\Admin\AppData\Local\WindowsSecurity\Vfd663501e1ac13eb331505b8388e675450.exe
Size 121KB
SHA256 0792aa1b02541d3073171a711b5fe4563b4a7084cfc228606e696d17e45324e5
MD5 35625d89730f70f12ecdeaf795722865
SHA1 0fedcad5039e3317d0e434bb038b81850e8f3599
SHA512 edef804d22bf09d6eb3dfa397fb8ca609967a4af77db0cbb79aafee1510cd7f0a6087f7b66316592b14bff775df20b0877a58c9ee14fbe77a91171a7559fb301
SSDEEP 3072:qQ2NGg7V7MOrwPRT3KhM9bFcLyoDtfXtRW5FhpAB0H/aAz:aGmg9bFc/p25FJa
MD5 SHA1 SHA512 SSDEEP

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memory/408-11-0x00007FFF54460000-0x00007FFF54F21000-memory.dmp

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memory/408-12-0x00000214C7EE0000-0x00000214C7EF0000-memory.dmp

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memory/2580-0-0x00000215DCD60000-0x00000215DCD84000-memory.dmp

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memory/2580-1-0x00007FFF56070000-0x00007FFF56B31000-memory.dmp

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memory/2580-2-0x00000215DEC10000-0x00000215DEC20000-memory.dmp

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memory/2580-6-0x00007FFF56070000-0x00007FFF56B31000-memory.dmp

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