darkvnc | dbe884a85be7dce2d3db0efb74b9b3c39f5be64730dcce6f7c9e17acc6e444eb

General

Target

usfive_20210718-044029.exe
Size

455KB
MD5

6acecf7a244dbbf26483578e4dc597d5
SHA1

f1a62a55910bd825459ad1fd9b8a4e64f2d7485f
SHA256

dbe884a85be7dce2d3db0efb74b9b3c39f5be64730dcce6f7c9e17acc6e444eb
SHA512

441aef1f9512ab94eeada971d48ec7a56aef061292f0b10880f36f2a8baa9166ff3ad2e4c13aa785d9f6799d694939432d742fd2e627435f021d000ded26c1fe

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 2012 created 3672	2012	WerFault.exe	78

DarkVNC Payload 3 IoCs

rat

resource	yara_rule
behavioral2/memory/3672-128-0x00000000025D0000-0x0000000002658000-memory.dmp	darkvnc
behavioral2/memory/3672-129-0x0000000000400000-0x00000000009CC000-memory.dmp	darkvnc
behavioral2/memory/2136-131-0x00000281827D0000-0x000002818289A000-memory.dmp	darkvnc

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
3672	hIbjuXFZwH.exe

Loads dropped DLL 6 IoCs

pid	Process
3944	usfive_20210718-044029.exe
3944	usfive_20210718-044029.exe
3944	usfive_20210718-044029.exe
3944	usfive_20210718-044029.exe
3944	usfive_20210718-044029.exe
3944	usfive_20210718-044029.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 3672 set thread context of 2136	3672	hIbjuXFZwH.exe	82

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
2012	3672	WerFault.exe	78

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3200	timeout.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe
2012	WerFault.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3672	hIbjuXFZwH.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeRestorePrivilege	2012	WerFault.exe
Token: SeBackupPrivilege	2012	WerFault.exe
Token: SeDebugPrivilege	2012	WerFault.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3944 wrote to memory of 3672	3944	usfive_20210718-044029.exe	78
PID 3944 wrote to memory of 3672	3944	usfive_20210718-044029.exe	78
PID 3944 wrote to memory of 3672	3944	usfive_20210718-044029.exe	78
PID 3944 wrote to memory of 3472	3944	usfive_20210718-044029.exe	79
PID 3944 wrote to memory of 3472	3944	usfive_20210718-044029.exe	79
PID 3944 wrote to memory of 3472	3944	usfive_20210718-044029.exe	79
PID 3472 wrote to memory of 3200	3472	cmd.exe	81
PID 3472 wrote to memory of 3200	3472	cmd.exe	81
PID 3472 wrote to memory of 3200	3472	cmd.exe	81
PID 3672 wrote to memory of 2136	3672	hIbjuXFZwH.exe	82
PID 3672 wrote to memory of 2136	3672	hIbjuXFZwH.exe	82
PID 3672 wrote to memory of 2136	3672	hIbjuXFZwH.exe	82
PID 3672 wrote to memory of 2136	3672	hIbjuXFZwH.exe	82
PID 3672 wrote to memory of 2136	3672	hIbjuXFZwH.exe	82

C:\Users\Admin\AppData\Local\Temp\usfive_20210718-044029.exe
"C:\Users\Admin\AppData\Local\Temp\usfive_20210718-044029.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:3944
- C:\Users\Admin\AppData\Local\Temp\hIbjuXFZwH.exe
  "C:\Users\Admin\AppData\Local\Temp\hIbjuXFZwH.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3672
- - C:\Windows\system32\WerFault.exe
    C:\Windows\system32\WerFault.exe
    3⤵
    PID:2136
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3672 -s 500
    3⤵
    - Suspicious use of NtCreateProcessExOtherParentProcess
    - Program crash
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2012
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /C timeout /T 10 /NOBREAK > Nul & Del /f /q "C:\Users\Admin\AppData\Local\Temp\usfive_20210718-044029.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3472
- - C:\Windows\SysWOW64\timeout.exe
    timeout /T 10 /NOBREAK
    3⤵
    - Delays execution with timeout.exe
    PID:3200

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/2136-131-0x00000281827D0000-0x000002818289A000-memory.dmp

Filesize
808KB

Download
memory/2136-130-0x0000028182540000-0x0000028182569000-memory.dmp

Filesize
164KB

Download
memory/3672-128-0x00000000025D0000-0x0000000002658000-memory.dmp

Filesize
544KB

Download
memory/3672-129-0x0000000000400000-0x00000000009CC000-memory.dmp

Filesize
5.8MB

Download
memory/3944-114-0x0000000002640000-0x00000000026D3000-memory.dmp

Filesize
588KB

Download
memory/3944-115-0x0000000000400000-0x00000000009ED000-memory.dmp

Filesize
5.9MB

Download

Analysis

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