gurcu | c330322b774eb263b008178ff707e13b843fd7df62445cca3c52356509c26f78

General

Target

file.exe
Size

308KB
MD5

d5b8ac0d80c99e7dda0d9df17c159f3d
SHA1

ae1e0aeb3fbba55999b74047ee2b8bb4e45f108a
SHA256

c330322b774eb263b008178ff707e13b843fd7df62445cca3c52356509c26f78
SHA512

2637cc05aa402832dadbf48431f1add417b69a8351de2a5edae80283da7a6924166ea56bc85865dfa993d88f467d8f540528627e5cbe64cc67ec8d5a3d6655bc
SSDEEP

6144:+MW2MDA5DDzwLLoMC9YsbxE0UyRtXpJldoopDIrhi7m:EREZELLoMeYkxEgJzTp

Score

10^/10

gurcu collection discovery persistence privilege_escalation spyware stealer

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot7722280561:AAEgRsAuRdqeD2qmEUjdhEM6F9R5eAxwIT4/sendMessage?chat_id=7734728653

Signatures

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

Checks computer location settings 2 TTPs 2 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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	build.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	file.exe

Executes dropped EXE 1 IoCs

pid	Process
920	build.exe

Reads WinSCP keys stored on the system 2 TTPs
Tries to access WinSCP stored sessions.
spyware stealer

Data from Local System
T1005

Credentials in Registry
T1552.002
Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook profiles 1 TTPs 9 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\19.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.exe
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\20.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.exe
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\14.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.exe
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.exe
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.exe
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\17.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.exe
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\18.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.exe
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.exe
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\13.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.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
14	ip-api.com

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 6 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\Microsoft\NetSh	netsh.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	file.exe

System Network Configuration Discovery: Wi-Fi Discovery 1 TTPs 2 IoCs

Adversaries may search for information about Wi-Fi networks, such as network names and passwords, on compromised systems.

discovery

Wi-Fi Discovery

T1016.002

pid	Process
4820	cmd.exe
4944	netsh.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2312	timeout.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
920	build.exe
920	build.exe
920	build.exe
920	build.exe
920	build.exe

Suspicious use of AdjustPrivilegeToken 13 IoCs

description	pid	Process
Token: SeDebugPrivilege	920	build.exe
Token: SeAssignPrimaryTokenPrivilege	920	build.exe
Token: SeIncreaseQuotaPrivilege	920	build.exe
Token: SeSecurityPrivilege	920	build.exe
Token: SeTakeOwnershipPrivilege	920	build.exe
Token: SeLoadDriverPrivilege	920	build.exe
Token: SeSystemtimePrivilege	920	build.exe
Token: SeBackupPrivilege	920	build.exe
Token: SeRestorePrivilege	920	build.exe
Token: SeShutdownPrivilege	920	build.exe
Token: SeSystemEnvironmentPrivilege	920	build.exe
Token: SeUndockPrivilege	920	build.exe
Token: SeManageVolumePrivilege	920	build.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 5004 wrote to memory of 920	5004	file.exe	86
PID 5004 wrote to memory of 920	5004	file.exe	86
PID 920 wrote to memory of 4820	920	build.exe	88
PID 920 wrote to memory of 4820	920	build.exe	88
PID 4820 wrote to memory of 4784	4820	cmd.exe	90
PID 4820 wrote to memory of 4784	4820	cmd.exe	90
PID 4820 wrote to memory of 4944	4820	cmd.exe	91
PID 4820 wrote to memory of 4944	4820	cmd.exe	91
PID 4820 wrote to memory of 3172	4820	cmd.exe	92
PID 4820 wrote to memory of 3172	4820	cmd.exe	92
PID 920 wrote to memory of 4172	920	build.exe	94
PID 920 wrote to memory of 4172	920	build.exe	94
PID 4172 wrote to memory of 4032	4172	cmd.exe	96
PID 4172 wrote to memory of 4032	4172	cmd.exe	96
PID 4172 wrote to memory of 4864	4172	cmd.exe	97
PID 4172 wrote to memory of 4864	4172	cmd.exe	97
PID 4172 wrote to memory of 4884	4172	cmd.exe	98
PID 4172 wrote to memory of 4884	4172	cmd.exe	98
PID 920 wrote to memory of 3416	920	build.exe	116
PID 920 wrote to memory of 3416	920	build.exe	116
PID 3416 wrote to memory of 4524	3416	cmd.exe	118
PID 3416 wrote to memory of 4524	3416	cmd.exe	118
PID 3416 wrote to memory of 2312	3416	cmd.exe	119
PID 3416 wrote to memory of 2312	3416	cmd.exe	119

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\20.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	build.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5004
- C:\Users\Admin\AppData\Local\Temp\build.exe
  "C:\Users\Admin\AppData\Local\Temp\build.exe"
  2⤵
  - Checks computer location settings
  - 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:920
- - C:\Windows\SYSTEM32\cmd.exe
    "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
    3⤵
    - System Network Configuration Discovery: Wi-Fi Discovery
    - Suspicious use of WriteProcessMemory
    PID:4820
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:4784
  - - C:\Windows\system32\netsh.exe
      netsh wlan show profiles
      4⤵
      Event Triggered Execution: Netsh Helper DLL
      System Network Configuration Discovery: Wi-Fi Discovery
      PID:4944
  - - C:\Windows\system32\findstr.exe
      findstr /R /C:"[ ]:[ ]"
      4⤵
      PID:3172
- - 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:4172
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:4032
  - - C:\Windows\system32\netsh.exe
      netsh wlan show networks mode=bssid
      4⤵
      Event Triggered Execution: Netsh Helper DLL
      PID:4864
  - - C:\Windows\system32\findstr.exe
      findstr "SSID BSSID Signal"
      4⤵
      PID:4884
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C chcp 65001 && timeout /t 3 > NUL && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\build.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3416
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:4524
  - - C:\Windows\system32\timeout.exe
      timeout /t 3
      4⤵
      Delays execution with timeout.exe
      PID:2312

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

1

T1546

Netsh Helper DLL

1

T1546.007

Privilege Escalation

Event Triggered Execution

1

T1546

Netsh Helper DLL

1

T1546.007

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

2

T1552

Credentials In Files

1

T1552.001

Credentials in Registry

1

T1552.002

Discovery

Browser Information Discovery

Query Registry

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Wi-Fi Discovery

1

T1016.002

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\build.exe

Filesize
223KB

MD5
ecc94919c7d1385d489961b21af97328

SHA1
82f01aac4fdeb34ec23900d73b64beb01ea5a843

SHA256
f47224fc9bd939839623ac7eb8f86d735d0dcd8ba7b2c256125850efd6401059

SHA512
87213dfdd9901788de45572630d766739c3fa262624f3c891620d0624b1d32d908f529859ae106ed1e0b7d203c0a986db1198e226c2cf0e6070837d40ec13190

Download Submit
memory/920-15-0x00007FF8E3DA3000-0x00007FF8E3DA5000-memory.dmp

Filesize
8KB

Download
memory/920-16-0x00000241233B0000-0x00000241233E8000-memory.dmp

Filesize
224KB

Download
memory/920-18-0x00007FF8E3DA0000-0x00007FF8E4861000-memory.dmp

Filesize
10.8MB

Download
memory/920-19-0x00007FF8E3DA3000-0x00007FF8E3DA5000-memory.dmp

Filesize
8KB

Download
memory/920-20-0x00007FF8E3DA0000-0x00007FF8E4861000-memory.dmp

Filesize
10.8MB

Download
memory/920-23-0x00007FF8E3DA0000-0x00007FF8E4861000-memory.dmp

Filesize
10.8MB

Download
memory/5004-0-0x000000007506E000-0x000000007506F000-memory.dmp

Filesize
4KB

Download
memory/5004-1-0x0000000000590000-0x00000000005E4000-memory.dmp

Filesize
336KB

Download
memory/5004-3-0x0000000075060000-0x0000000075810000-memory.dmp

Filesize
7.7MB

Download
memory/5004-17-0x0000000075060000-0x0000000075810000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads