darkvnc | 81d0fef5f97170c04985042d646bcf48d541852d047598791bc35c5187262917

General

Target

usfive_20210718-142250.exe
Size

472KB
MD5

c3496df55defe6055694d5f6415bf9ee
SHA1

1d02dd7d82984ad2ae47cab8390059e3f5316649
SHA256

81d0fef5f97170c04985042d646bcf48d541852d047598791bc35c5187262917
SHA512

291152969a90da00d39016e57b64cce7c1a090db5560e3adc4b7faf233857e80d203d12116ecbf884c4b5aa1aab1cf1f64920683a6ecf7b66fa17257dd860714

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 648 created 3888	648	WerFault.exe	77

DarkVNC Payload 2 IoCs

rat

resource	yara_rule
behavioral2/memory/3888-130-0x0000000000400000-0x00000000008D0000-memory.dmp	darkvnc
behavioral2/memory/3888-129-0x0000000000B60000-0x0000000000BE8000-memory.dmp	darkvnc

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
3888	xhgcEVFLPK.exe

Loads dropped DLL 6 IoCs

pid	Process
4652	usfive_20210718-142250.exe
4652	usfive_20210718-142250.exe
4652	usfive_20210718-142250.exe
4652	usfive_20210718-142250.exe
4652	usfive_20210718-142250.exe
4652	usfive_20210718-142250.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 3888 set thread context of 4188	3888	xhgcEVFLPK.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
648	3888	WerFault.exe	77

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2660	timeout.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe
648	WerFault.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3888	xhgcEVFLPK.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeRestorePrivilege	648	WerFault.exe
Token: SeBackupPrivilege	648	WerFault.exe
Token: SeDebugPrivilege	648	WerFault.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4652 wrote to memory of 3888	4652	usfive_20210718-142250.exe	77
PID 4652 wrote to memory of 3888	4652	usfive_20210718-142250.exe	77
PID 4652 wrote to memory of 3888	4652	usfive_20210718-142250.exe	77
PID 4652 wrote to memory of 3984	4652	usfive_20210718-142250.exe	78
PID 4652 wrote to memory of 3984	4652	usfive_20210718-142250.exe	78
PID 4652 wrote to memory of 3984	4652	usfive_20210718-142250.exe	78
PID 3984 wrote to memory of 2660	3984	cmd.exe	80
PID 3984 wrote to memory of 2660	3984	cmd.exe	80
PID 3984 wrote to memory of 2660	3984	cmd.exe	80
PID 3888 wrote to memory of 4188	3888	xhgcEVFLPK.exe	81
PID 3888 wrote to memory of 4188	3888	xhgcEVFLPK.exe	81
PID 3888 wrote to memory of 4188	3888	xhgcEVFLPK.exe	81
PID 3888 wrote to memory of 4188	3888	xhgcEVFLPK.exe	81
PID 3888 wrote to memory of 4188	3888	xhgcEVFLPK.exe	81

C:\Users\Admin\AppData\Local\Temp\usfive_20210718-142250.exe
"C:\Users\Admin\AppData\Local\Temp\usfive_20210718-142250.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:4652
- C:\Users\Admin\AppData\Local\Temp\xhgcEVFLPK.exe
  "C:\Users\Admin\AppData\Local\Temp\xhgcEVFLPK.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3888
- - C:\Windows\system32\WerFault.exe
    C:\Windows\system32\WerFault.exe
    3⤵
    PID:4188
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3888 -s 472
    3⤵
    - Suspicious use of NtCreateProcessExOtherParentProcess
    - Program crash
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:648
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /C timeout /T 10 /NOBREAK > Nul & Del /f /q "C:\Users\Admin\AppData\Local\Temp\usfive_20210718-142250.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3984
- - C:\Windows\SysWOW64\timeout.exe
    timeout /T 10 /NOBREAK
    3⤵
    - Delays execution with timeout.exe
    PID:2660

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

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Downloads

memory/3888-130-0x0000000000400000-0x00000000008D0000-memory.dmp

Filesize
4.8MB

Download
memory/3888-129-0x0000000000B60000-0x0000000000BE8000-memory.dmp

Filesize
544KB

Download
memory/4188-132-0x0000026470A90000-0x0000026470D89000-memory.dmp

Filesize
3.0MB

Download
memory/4188-131-0x0000026470860000-0x0000026470889000-memory.dmp

Filesize
164KB

Download
memory/4652-114-0x0000000000BB0000-0x0000000000C43000-memory.dmp

Filesize
588KB

Download
memory/4652-115-0x0000000000400000-0x00000000008E0000-memory.dmp

Filesize
4.9MB

Download

Analysis

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