bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e

Analysis

max time kernel
149s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
27/05/2024, 08:52

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General

Target
bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e.exe
Size 406KB
Sample240527-ks3dwsec41
SHA256 bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e
MD5 bbefe81d8eee3d121bbd1b173ba10815
SHA1 9883fa610789b7992be4b7f800dd896e121dd52d
SHA512 0573705fbd3684d831f99661080db0ee36a4a5b992f15ccf9a6cb2cc91d9079e0d38310f6ab581e5f7f6dd43eac5aee1ce085f764af51f1bde24937c6ac894d0
SSDEEP 6144:3w9D91dOrcN3ZGXNYFNmIkYvUIelVjjVtGRyFH4:gtRfJcNYFNm8UhlZGse
MD5 SHA1 SHA512 SSDEEP

Score

8^/10

bootkit persistence spyware stealer

Malware Config

Signatures

Blocklisted process makes network request 8 IoCs

flow	pid	Process
15	2208	rundll32.exe
22	2208	rundll32.exe
23	2208	rundll32.exe
24	2208	rundll32.exe
35	2208	rundll32.exe
36	2208	rundll32.exe
40	2208	rundll32.exe
47	2208	rundll32.exe

Deletes itself 1 IoCs

pid	Process
4756	jsbzb.exe

Executes dropped EXE 1 IoCs

pid	Process
4756	jsbzb.exe

Loads dropped DLL 1 IoCs

pid	Process
2208	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-1-5-21-540404634-651139247-2967210625-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Dotx = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\wduyaz\\sazwfq.dll\",Verify"	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)	\??\s:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	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

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2208	rundll32.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\wduyaz	jsbzb.exe
File created	\??\c:\Program Files\wduyaz\sazwfq.dll	jsbzb.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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1248	PING.EXE

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe
2208	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2208	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
364	bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e.exe
4756	jsbzb.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 364 wrote to memory of 4540	364	bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e.exe	83
PID 364 wrote to memory of 4540	364	bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e.exe	83
PID 364 wrote to memory of 4540	364	bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e.exe	83
PID 4540 wrote to memory of 1248	4540	cmd.exe	85
PID 4540 wrote to memory of 1248	4540	cmd.exe	85
PID 4540 wrote to memory of 1248	4540	cmd.exe	85
PID 4540 wrote to memory of 4756	4540	cmd.exe	88
PID 4540 wrote to memory of 4756	4540	cmd.exe	88
PID 4540 wrote to memory of 4756	4540	cmd.exe	88
PID 4756 wrote to memory of 2208	4756	jsbzb.exe	89
PID 4756 wrote to memory of 2208	4756	jsbzb.exe	89
PID 4756 wrote to memory of 2208	4756	jsbzb.exe	89

C:\Users\Admin\AppData\Local\Temp\bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e.exe
"C:\Users\Admin\AppData\Local\Temp\bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e.exe"
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:364
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\jsbzb.exe "C:\Users\Admin\AppData\Local\Temp\bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4540
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:1248
- - C:\Users\Admin\AppData\Local\Temp\jsbzb.exe
    C:\Users\Admin\AppData\Local\Temp\\jsbzb.exe "C:\Users\Admin\AppData\Local\Temp\bea41c92184550fd40b18356f0f6c9d277466f6e8bda54e41d1303542b6ad69e.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4756
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\wduyaz\sazwfq.dll",Verify C:\Users\Admin\AppData\Local\Temp\jsbzb.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)
      Suspicious use of NtSetInformationThreadHideFromDebugger
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2208

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

jsbzb.exe

Path C:\Users\Admin\AppData\Local\Temp\jsbzb.exe
Size 406KB
SHA256 6c8c8cffca4eb853f7ce8f17a84e5ddc6cfd76f2a73ca512b2b5f377748646bb
MD5 a2b01425a6c56d2c29330044cbaf6aff
SHA1 1633688477c79f0406ed139fc625b003e4fda930
SHA512 7f0024a51875655fe59169e93b0b62a45a59759642fa16bee1aa83486b1d93cc6a4844130f60d7cd62122ecd5e2d75c2f6771bc6368b2d32968a4a7e24b56c70
SSDEEP 6144:3w9D91dOrcN3ZGXNYFNmIkYvUIelVjjVtGRyFH4I:gtRfJcNYFNm8UhlZGseI
MD5 SHA1 SHA512 SSDEEP

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sazwfq.dll

Path \??\c:\Program Files\wduyaz\sazwfq.dll
Size 228KB
SHA256 339e7b0252753e51264dd38c02878fa42af517d57a0aca0037758797a4718984
MD5 18064cbba4ed6d8ae2141feea2cae61e
SHA1 a05abdeae6a8401601530007d6d0fa52f02dfb5d
SHA512 8c70cdca3eb4f80e4c999e02744f53708fb99e2eb0d31dae4d87a11025e676e7660be2bb8a3e7c77d036abeebc6efabc7e2f9f1e46fbd3c99931fe782afc7a54
SSDEEP 6144:U1oEITTl5VCuHFrEy0wEOR7ndfAnVxERZ4CR3XaNY:5vVrHFrL05gdonVANpB
MD5 SHA1 SHA512 SSDEEP

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memory/364-0-0x0000000000400000-0x0000000000464000-memory.dmp

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memory/364-2-0x0000000000400000-0x0000000000464000-memory.dmp

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memory/2208-10-0x0000000010000000-0x0000000010080000-memory.dmp

Download

memory/2208-11-0x0000000010000000-0x0000000010080000-memory.dmp

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memory/2208-13-0x0000000010000000-0x0000000010080000-memory.dmp

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memory/4756-7-0x0000000000400000-0x0000000000464000-memory.dmp

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