darkvnc | 86b3b60d044d90b22c1285027ad44cc36b3c83ab2c4174fb92ef07cbe1d76cac

General

Target

usfive_20210718-090922.exe
Size

499KB
MD5

982f58d704d00ef6fa9a90d3fee6b98b
SHA1

810959da0fdbd7667a5356282b1e9bb2bdb21d72
SHA256

86b3b60d044d90b22c1285027ad44cc36b3c83ab2c4174fb92ef07cbe1d76cac
SHA512

0d19255e57b3eb47fa42c6b1fec153f5926b0043ae8ed939ef9df1d16bc145928d0ab824091bb39b5e597c6c8efcf41a0fa4cdc9870569889e7ea680b014e065

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 3772 created 4024	3772	WerFault.exe	79

DarkVNC Payload 2 IoCs

rat

resource	yara_rule
behavioral2/memory/4024-129-0x0000000000B40000-0x0000000000BC8000-memory.dmp	darkvnc
behavioral2/memory/4024-130-0x0000000000400000-0x00000000009CC000-memory.dmp	darkvnc

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
4024	ioTH8HtNXY.exe

Loads dropped DLL 6 IoCs

pid	Process
3876	usfive_20210718-090922.exe
3876	usfive_20210718-090922.exe
3876	usfive_20210718-090922.exe
3876	usfive_20210718-090922.exe
3876	usfive_20210718-090922.exe
3876	usfive_20210718-090922.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 4024 set thread context of 3348	4024	ioTH8HtNXY.exe	83

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
3772	4024	WerFault.exe	79

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3900	timeout.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe
3772	WerFault.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4024	ioTH8HtNXY.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeRestorePrivilege	3772	WerFault.exe
Token: SeBackupPrivilege	3772	WerFault.exe
Token: SeDebugPrivilege	3772	WerFault.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3876 wrote to memory of 4024	3876	usfive_20210718-090922.exe	79
PID 3876 wrote to memory of 4024	3876	usfive_20210718-090922.exe	79
PID 3876 wrote to memory of 4024	3876	usfive_20210718-090922.exe	79
PID 3876 wrote to memory of 972	3876	usfive_20210718-090922.exe	80
PID 3876 wrote to memory of 972	3876	usfive_20210718-090922.exe	80
PID 3876 wrote to memory of 972	3876	usfive_20210718-090922.exe	80
PID 972 wrote to memory of 3900	972	cmd.exe	82
PID 972 wrote to memory of 3900	972	cmd.exe	82
PID 972 wrote to memory of 3900	972	cmd.exe	82
PID 4024 wrote to memory of 3348	4024	ioTH8HtNXY.exe	83
PID 4024 wrote to memory of 3348	4024	ioTH8HtNXY.exe	83
PID 4024 wrote to memory of 3348	4024	ioTH8HtNXY.exe	83
PID 4024 wrote to memory of 3348	4024	ioTH8HtNXY.exe	83
PID 4024 wrote to memory of 3348	4024	ioTH8HtNXY.exe	83

C:\Users\Admin\AppData\Local\Temp\usfive_20210718-090922.exe
"C:\Users\Admin\AppData\Local\Temp\usfive_20210718-090922.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:3876
- C:\Users\Admin\AppData\Local\Temp\ioTH8HtNXY.exe
  "C:\Users\Admin\AppData\Local\Temp\ioTH8HtNXY.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:4024
- - C:\Windows\system32\WerFault.exe
    C:\Windows\system32\WerFault.exe
    3⤵
    PID:3348
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4024 -s 484
    3⤵
    - Suspicious use of NtCreateProcessExOtherParentProcess
    - Program crash
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3772
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /C timeout /T 10 /NOBREAK > Nul & Del /f /q "C:\Users\Admin\AppData\Local\Temp\usfive_20210718-090922.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:972
- - C:\Windows\SysWOW64\timeout.exe
    timeout /T 10 /NOBREAK
    3⤵
    - Delays execution with timeout.exe
    PID:3900

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

Loading Replay Monitor...

Downloads

memory/3348-131-0x0000020451280000-0x0000020451281000-memory.dmp

Filesize
4KB

Download
memory/3348-132-0x0000020451190000-0x00000204511B9000-memory.dmp

Filesize
164KB

Download
memory/3876-115-0x0000000000400000-0x00000000009DC000-memory.dmp

Filesize
5.9MB

Download
memory/3876-114-0x0000000002680000-0x0000000002713000-memory.dmp

Filesize
588KB

Download
memory/4024-130-0x0000000000400000-0x00000000009CC000-memory.dmp

Filesize
5.8MB

Download
memory/4024-129-0x0000000000B40000-0x0000000000BC8000-memory.dmp

Filesize
544KB

Download

Analysis

Sharing