b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d

Analysis

max time kernel
142s
max time network
135s
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, 00:29

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General

Target
b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d.exe
Size 109KB
Sample240507-as4xlsac2y
SHA256 b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d
MD5 4f42f06755eea2f2b3dff802102fb874
SHA1 36f0c0d9d2f27728986963fd5af11b3dd5ca97ff
SHA512 e14b94f21a5adaeb138a02d32030edf60d3615a33542a1ab4579aece74d1f83c6b109806020b440be51d1ee7bde81615c832d1c4eb1bc639f3079ab8ffdaf0e1
SSDEEP 1536:TRiAXaKD5grAhdVA2VukXKzMf3liaL+SWzR+fy1ZZosMiZ7RtEsH:liAXaKDLVaroj6SWzosZGyRtEs
MD5 SHA1 SHA512 SSDEEP

Score

9^/10

bootkit persistence spyware stealer

Malware Config

Signatures

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral2/memory/4780-13-0x0000000010000000-0x0000000010036000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4780-15-0x0000000010000000-0x0000000010036000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4780-17-0x0000000010000000-0x0000000010036000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Blocklisted process makes network request 8 IoCs

flow	pid	Process
26	4780	rundll32.exe
31	4780	rundll32.exe
33	4780	rundll32.exe
34	4780	rundll32.exe
52	4780	rundll32.exe
53	4780	rundll32.exe
69	4780	rundll32.exe
83	4780	rundll32.exe

Deletes itself 1 IoCs

pid	Process
2976	jflapyo.exe

Executes dropped EXE 1 IoCs

pid	Process
2976	jflapyo.exe

Loads dropped DLL 1 IoCs

pid	Process
4780	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

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-1-5-21-17203666-93769886-2545153620-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\rswvgomto\\hymbd.dll\",GetWindowClass"	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)	\??\b:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\i:	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

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
544	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4780	rundll32.exe
4780	rundll32.exe
4780	rundll32.exe
4780	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4780	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4976	b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d.exe
2976	jflapyo.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4976 wrote to memory of 4824	4976	b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d.exe	84
PID 4976 wrote to memory of 4824	4976	b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d.exe	84
PID 4976 wrote to memory of 4824	4976	b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d.exe	84
PID 4824 wrote to memory of 544	4824	cmd.exe	86
PID 4824 wrote to memory of 544	4824	cmd.exe	86
PID 4824 wrote to memory of 544	4824	cmd.exe	86
PID 4824 wrote to memory of 2976	4824	cmd.exe	89
PID 4824 wrote to memory of 2976	4824	cmd.exe	89
PID 4824 wrote to memory of 2976	4824	cmd.exe	89
PID 2976 wrote to memory of 4780	2976	jflapyo.exe	90
PID 2976 wrote to memory of 4780	2976	jflapyo.exe	90
PID 2976 wrote to memory of 4780	2976	jflapyo.exe	90

C:\Users\Admin\AppData\Local\Temp\b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d.exe
"C:\Users\Admin\AppData\Local\Temp\b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d.exe"
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4976
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\jflapyo.exe "C:\Users\Admin\AppData\Local\Temp\b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4824
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:544
- - \??\c:\jflapyo.exe
    c:\jflapyo.exe "C:\Users\Admin\AppData\Local\Temp\b33f9e06836282352f3ba62011341e0f8301b669c7bbedb379adaa385c22f96d.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2976
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\rswvgomto\hymbd.dll",GetWindowClass c:\jflapyo.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:4780

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

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Downloads

jflapyo.exe

Path C:\jflapyo.exe
Size 109KB
SHA256 09b08e2ac3a3402c0ab099af640a3199e75841e8abcc7d87d9e85fa3fdce1df3
MD5 e459c9140d96a4f259503679f7be19f4
SHA1 f936be7c7736cdcc7434fd7c60e1c0b48b2d3d0b
SHA512 53d91a1a1827d5f98f85268eee3cb666acd34d2ad09c68f47d6fe25d93af2ca64570f63cde88757d222d03251282bff201f8407f379f3ce610e615bd73abf726
SSDEEP 1536:TRiAXaKD5grAhdVA2VukXKzMf3liaL+SWzR+fy1ZZosMiZ7RtEsHp:liAXaKDLVaroj6SWzosZGyRtEsJ
MD5 SHA1 SHA512 SSDEEP

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hymbd.dll

Path \??\c:\rswvgomto\hymbd.dll
Size 63KB
SHA256 19f33ba32f20dae1ea6a6b87824dc8e3e74527b34f9cd01a6e4f67e3e79dd867
MD5 06c39ca503305efbf7274f6bf9394f28
SHA1 bec4daadab49f1f58a951d9cc1b2d7c1e2ae8450
SHA512 e6c8b19892b5ce5108909824ad37b0fe0eed2459939f0249133bf3e3c1470308d6d51aa3fbf42aabcbf37bb2412c8a27bff445e23dc0495910ec5f445055d931
SSDEEP 1536:WBgQPJw/1HCl8h1hPkLzPT9d2xQLoChpX7wD5OHVAEx:Weq2/1HCa1EzPTfWQM6X74oVp
MD5 SHA1 SHA512 SSDEEP

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memory/2976-6-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/2976-8-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4780-11-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4780-12-0x0000000001250000-0x0000000001252000-memory.dmp

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memory/4780-13-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4780-15-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4780-17-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4976-0-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4976-2-0x0000000000400000-0x000000000041D000-memory.dmp

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