darkvnc | 156376c86635ab2c4156042836fabbd8245038ed7976d8eff0a1f2b297ab4a2b

General

Target

usfive_20210718-120139.exe
Size

472KB
MD5

18cd767dddb2c001c1c63412f57265f6
SHA1

850e3f4c8acee7093cffa375f782534600476564
SHA256

156376c86635ab2c4156042836fabbd8245038ed7976d8eff0a1f2b297ab4a2b
SHA512

ca626fcbbc74f764c8ec5ff3b99e01e99a692ae0bd395345f7f08135c005aee0c68316ffae31754f859e30a36f4b6f52a950b9a877d599402ecce50e5ecacd1b

Score

10^/10

darkvnc discovery rat spyware stealer

Malware Config

Signatures

DarkVNC
DarkVNC is a malicious version of the famous VNC software.
rat darkvnc

Suspicious use of NtCreateProcessExOtherParentProcess 1 IoCs

description	pid	Process	procid_target
PID 1572 created 516	1572	WerFault.exe	77

DarkVNC Payload 3 IoCs

rat

resource	yara_rule
behavioral2/memory/516-129-0x0000000000400000-0x00000000008D0000-memory.dmp	darkvnc
behavioral2/memory/516-128-0x0000000000B90000-0x0000000000C18000-memory.dmp	darkvnc
behavioral2/memory/2080-131-0x000001B76F8A0000-0x000001B76F96A000-memory.dmp	darkvnc

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
516	8kx9FX4gEG.exe

Loads dropped DLL 6 IoCs

pid	Process
580	usfive_20210718-120139.exe
580	usfive_20210718-120139.exe
580	usfive_20210718-120139.exe
580	usfive_20210718-120139.exe
580	usfive_20210718-120139.exe
580	usfive_20210718-120139.exe

Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
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
T1081
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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 516 set thread context of 2080	516	8kx9FX4gEG.exe	81

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1572	516	WerFault.exe	77

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1244	timeout.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe
1572	WerFault.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
516	8kx9FX4gEG.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeRestorePrivilege	1572	WerFault.exe
Token: SeBackupPrivilege	1572	WerFault.exe
Token: SeDebugPrivilege	1572	WerFault.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 580 wrote to memory of 516	580	usfive_20210718-120139.exe	77
PID 580 wrote to memory of 516	580	usfive_20210718-120139.exe	77
PID 580 wrote to memory of 516	580	usfive_20210718-120139.exe	77
PID 580 wrote to memory of 3356	580	usfive_20210718-120139.exe	78
PID 580 wrote to memory of 3356	580	usfive_20210718-120139.exe	78
PID 580 wrote to memory of 3356	580	usfive_20210718-120139.exe	78
PID 3356 wrote to memory of 1244	3356	cmd.exe	80
PID 3356 wrote to memory of 1244	3356	cmd.exe	80
PID 3356 wrote to memory of 1244	3356	cmd.exe	80
PID 516 wrote to memory of 2080	516	8kx9FX4gEG.exe	81
PID 516 wrote to memory of 2080	516	8kx9FX4gEG.exe	81
PID 516 wrote to memory of 2080	516	8kx9FX4gEG.exe	81
PID 516 wrote to memory of 2080	516	8kx9FX4gEG.exe	81
PID 516 wrote to memory of 2080	516	8kx9FX4gEG.exe	81

C:\Users\Admin\AppData\Local\Temp\usfive_20210718-120139.exe
"C:\Users\Admin\AppData\Local\Temp\usfive_20210718-120139.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:580
- C:\Users\Admin\AppData\Local\Temp\8kx9FX4gEG.exe
  "C:\Users\Admin\AppData\Local\Temp\8kx9FX4gEG.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:516
- - C:\Windows\system32\WerFault.exe
    C:\Windows\system32\WerFault.exe
    3⤵
    PID:2080
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 516 -s 484
    3⤵
    - Suspicious use of NtCreateProcessExOtherParentProcess
    - Program crash
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1572
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /C timeout /T 10 /NOBREAK > Nul & Del /f /q "C:\Users\Admin\AppData\Local\Temp\usfive_20210718-120139.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3356
- - C:\Windows\SysWOW64\timeout.exe
    timeout /T 10 /NOBREAK
    3⤵
    - Delays execution with timeout.exe
    PID:1244

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/516-129-0x0000000000400000-0x00000000008D0000-memory.dmp

Filesize
4.8MB

Download
memory/516-128-0x0000000000B90000-0x0000000000C18000-memory.dmp

Filesize
544KB

Download
memory/580-114-0x0000000002690000-0x0000000002723000-memory.dmp

Filesize
588KB

Download
memory/580-115-0x0000000000400000-0x00000000008E0000-memory.dmp

Filesize
4.9MB

Download
memory/2080-130-0x000001B76F6A0000-0x000001B76F6F9000-memory.dmp

Filesize
356KB

Download
memory/2080-131-0x000001B76F8A0000-0x000001B76F96A000-memory.dmp

Filesize
808KB

Download

Analysis

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