024cca47181790dbb641e0c2ce0ef8eb255bb5a84f15e077506be39e457432e7

Analysis

max time kernel
132s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
07/05/2024, 12:54

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General

Target
8bdf4d8fa85844b818b7896bf7c15780_NEAS.exe
Size 196KB
Sample240507-p47j7sbb47
SHA256 024cca47181790dbb641e0c2ce0ef8eb255bb5a84f15e077506be39e457432e7
MD5 8bdf4d8fa85844b818b7896bf7c15780
SHA1 f009feae399985e1a171ec8699e18a8e5dfe7da0
SHA512 c52eb461d1fd972f03b9ddc09075b94dc7e4b701c7a8162bfb1884e661f27c7c4156964f0e9def0b3359c3c683a05b93494cf0d9bcec26d885eaf378776c3e96
SSDEEP 3072:a74MyJjjlLzVjN50BdQqlYgp72xzbuawaGO0OJw8KWs6IgVLE7QkfIA:awj30dlZ+GVaRVLE7QkfI
MD5 SHA1 SHA512 SSDEEP

Score

8^/10

bootkit persistence spyware stealer upx

Malware Config

Signatures

Blocklisted process makes network request 7 IoCs

flow	pid	Process
19	4100	rundll32.exe
27	4100	rundll32.exe
29	4100	rundll32.exe
30	4100	rundll32.exe
47	4100	rundll32.exe
67	4100	rundll32.exe
68	4100	rundll32.exe

Deletes itself 1 IoCs

pid	Process
2760	bkfkw.exe

Executes dropped EXE 1 IoCs

pid	Process
2760	bkfkw.exe

Loads dropped DLL 1 IoCs

pid	Process
4100	rundll32.exe

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
T1552.001

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/3612-0-0x0000000000400000-0x000000000044A000-memory.dmp	upx
behavioral2/memory/3612-2-0x0000000000400000-0x000000000044A000-memory.dmp	upx
behavioral2/files/0x000d000000023ade-4.dat	upx
behavioral2/memory/2760-8-0x0000000000400000-0x000000000044A000-memory.dmp	upx

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-877519540-908060166-1852957295-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Micro = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\vnynt\\wblng.dll\",method"	rundll32.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	rundll32.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\vnynt	bkfkw.exe
File created	\??\c:\Program Files\vnynt\wblng.dll	bkfkw.exe

Checks processor information in registry 2 TTPs 2 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	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2708	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4100	rundll32.exe
4100	rundll32.exe
4100	rundll32.exe
4100	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4100	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3612	8bdf4d8fa85844b818b7896bf7c15780_NEAS.exe
2760	bkfkw.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3612 wrote to memory of 4280	3612	8bdf4d8fa85844b818b7896bf7c15780_NEAS.exe	84
PID 3612 wrote to memory of 4280	3612	8bdf4d8fa85844b818b7896bf7c15780_NEAS.exe	84
PID 3612 wrote to memory of 4280	3612	8bdf4d8fa85844b818b7896bf7c15780_NEAS.exe	84
PID 4280 wrote to memory of 2708	4280	cmd.exe	86
PID 4280 wrote to memory of 2708	4280	cmd.exe	86
PID 4280 wrote to memory of 2708	4280	cmd.exe	86
PID 4280 wrote to memory of 2760	4280	cmd.exe	90
PID 4280 wrote to memory of 2760	4280	cmd.exe	90
PID 4280 wrote to memory of 2760	4280	cmd.exe	90
PID 2760 wrote to memory of 4100	2760	bkfkw.exe	93
PID 2760 wrote to memory of 4100	2760	bkfkw.exe	93
PID 2760 wrote to memory of 4100	2760	bkfkw.exe	93

C:\Users\Admin\AppData\Local\Temp\8bdf4d8fa85844b818b7896bf7c15780_NEAS.exe
"C:\Users\Admin\AppData\Local\Temp\8bdf4d8fa85844b818b7896bf7c15780_NEAS.exe"
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3612
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\bkfkw.exe "C:\Users\Admin\AppData\Local\Temp\8bdf4d8fa85844b818b7896bf7c15780_NEAS.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4280
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:2708
- - C:\Users\Admin\AppData\Local\Temp\bkfkw.exe
    C:\Users\Admin\AppData\Local\Temp\\bkfkw.exe "C:\Users\Admin\AppData\Local\Temp\8bdf4d8fa85844b818b7896bf7c15780_NEAS.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2760
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\vnynt\wblng.dll",method C:\Users\Admin\AppData\Local\Temp\bkfkw.exe
      4⤵
      Blocklisted process makes network request
      Loads dropped DLL
      Adds Run key to start application
      Enumerates connected drives
      Writes to the Master Boot Record (MBR)
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4100

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

bkfkw.exe

Path C:\Users\Admin\AppData\Local\Temp\bkfkw.exe
Size 196KB
SHA256 5e20002d9656534a70c692e732571c408fc89aac1da1781dc88d5b91292f97f1
MD5 45903b3b9138d6a52bb75bb4829fb070
SHA1 8be4a8a5b1d2fc688a6704a34153187dbb5d3f4c
SHA512 29ad9364d51bc990035ff873540feb0552be4ac5d2e2f0562e34072c2971d7013f98dc1bdfc09ed8c879157d4802615fde690bf2ef6e7617121c923346842957
SSDEEP 3072:a74MyJjjlLzVjN50BdQqlYgp72xzbuawaGO0OJw8KWs6IgVLE7QkfIAg:awj30dlZ+GVaRVLE7QkfIp
MD5 SHA1 SHA512 SSDEEP

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wblng.dll

Path \??\c:\Program Files\vnynt\wblng.dll
Size 148KB
SHA256 ec14c4571963b7f173b5070c4aa4538ac056784c642a2dede9f2d9298bc4bca7
MD5 42ca7f62ed60d0f64dc544d5f1f4a68d
SHA1 4fa427e1c69e547b38ccb094b60562c69e6140b2
SHA512 79b65757aa0a199960957409f0020e435aeea78f0e9bbcafc893759e5d872b1bd7c439aae884b7caa6cca987a2aeb4bbe1469cf90904ef1efcf3efb9c844c664
SSDEEP 3072:VniPfUkOBCPiik5qOu5p/X+HB2n1Zn4419dYOfkYbN:1i38Bb5qOWlX+HY1Zn40958YZ
MD5 SHA1 SHA512 SSDEEP

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memory/2760-8-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/3612-0-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/3612-2-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/4100-14-0x0000000010000000-0x0000000010056000-memory.dmp

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memory/4100-12-0x0000000010050000-0x0000000010051000-memory.dmp

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memory/4100-11-0x0000000010000000-0x0000000010056000-memory.dmp

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memory/4100-15-0x0000000010000000-0x0000000010056000-memory.dmp

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