689555499fd2dff9a85acca987cf63ecb004150fb9428e7336b11a90eed8a4a6

Analysis

max time kernel
4265098s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-en-20220113
submitted
14/01/2022, 16:16

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General

Target

25031893-833908.xlsm
Size

83KB
MD5

a19739c3b8b42e530b0c39885a7eb572
SHA1

034d7b56335bc65f1010c24801f40f739f981418
SHA256

689555499fd2dff9a85acca987cf63ecb004150fb9428e7336b11a90eed8a4a6
SHA512

30cda33c13a7c5cbee38fc74846b6263ca20efc53434577855032e59f1e4376675d9f46b804e61964713d91fe7af8f9bcd3ffe010ebeec4461e45c38ea6c7238

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://therecyclingmachine.com/wp-admin/LzpOZSlkq90fYT1/

xlm40.dropper

http://zhongmaifangwu.com/TEST777/3U4Un0u/

Signatures

Process spawned unexpected child process 1 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	2000	1536	rundll32.exe	54

Blocklisted process makes network request 2 IoCs

flow	pid	Process
54	736	rundll32.exe
55	736	rundll32.exe

Downloads MZ/PE file

Loads dropped DLL 4 IoCs

pid	Process
2000	rundll32.exe
3404	rundll32.exe
3988	rundll32.exe
736	rundll32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Nyrxxjjgqiq\duixdulbk.hku	rundll32.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

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

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

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

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1536	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
736	rundll32.exe
736	rundll32.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
1536	EXCEL.EXE
1536	EXCEL.EXE
1536	EXCEL.EXE
1536	EXCEL.EXE
1536	EXCEL.EXE
1536	EXCEL.EXE
1536	EXCEL.EXE
1536	EXCEL.EXE
1536	EXCEL.EXE
1536	EXCEL.EXE
1536	EXCEL.EXE
1536	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1536 wrote to memory of 2000	1536	EXCEL.EXE	61
PID 1536 wrote to memory of 2000	1536	EXCEL.EXE	61
PID 1536 wrote to memory of 2000	1536	EXCEL.EXE	61
PID 2000 wrote to memory of 3404	2000	rundll32.exe	62
PID 2000 wrote to memory of 3404	2000	rundll32.exe	62
PID 2000 wrote to memory of 3404	2000	rundll32.exe	62
PID 3404 wrote to memory of 3988	3404	rundll32.exe	63
PID 3404 wrote to memory of 3988	3404	rundll32.exe	63
PID 3404 wrote to memory of 3988	3404	rundll32.exe	63
PID 3988 wrote to memory of 736	3988	rundll32.exe	64
PID 3988 wrote to memory of 736	3988	rundll32.exe	64
PID 3988 wrote to memory of 736	3988	rundll32.exe	64

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\25031893-833908.xlsm"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1536
- C:\Windows\SysWow64\rundll32.exe
  C:\Windows\SysWow64\rundll32.exe ..\erum.ocx,D"&"l"&"lR"&"egister"&"Serve"&"r
  2⤵
  - Process spawned unexpected child process
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2000
- - C:\Windows\SysWOW64\rundll32.exe
    C:\Windows\SysWOW64\rundll32.exe "C:\Users\Admin\erum.ocx",DllRegisterServer
    3⤵
    - Loads dropped DLL
    - Drops file in System32 directory
    - Suspicious use of WriteProcessMemory
    PID:3404
  - - C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Nyrxxjjgqiq\duixdulbk.hku",CtJWWIJGiBlb
      4⤵
      Loads dropped DLL
      Suspicious use of WriteProcessMemory
      PID:3988
    - - C:\Windows\SysWOW64\rundll32.exe
        
        C:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Nyrxxjjgqiq\duixdulbk.hku",DllRegisterServer
        5⤵
        Blocklisted process makes network request
        Loads dropped DLL
        Suspicious behavior: EnumeratesProcesses
        
        PID:736

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/736-177-0x0000000003171000-0x0000000003195000-memory.dmp

Filesize
144KB

Download
memory/736-181-0x00000000051B1000-0x00000000051D5000-memory.dmp

Filesize
144KB

Download
memory/736-183-0x0000000005211000-0x0000000005235000-memory.dmp

Filesize
144KB

Download
memory/736-185-0x00000000052F1000-0x0000000005315000-memory.dmp

Filesize
144KB

Download
memory/736-187-0x00000000053F1000-0x0000000005415000-memory.dmp

Filesize
144KB

Download
memory/1536-137-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-130-0x00007FFF6D450000-0x00007FFF6D460000-memory.dmp

Filesize
64KB

Download
memory/1536-143-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-144-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-145-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-146-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-147-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-148-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-150-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-151-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-149-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-142-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-141-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-140-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-189-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-139-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-138-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-136-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-135-0x000001663B1B0000-0x000001663B1B2000-memory.dmp

Filesize
8KB

Download
memory/1536-134-0x00007FFF6D450000-0x00007FFF6D460000-memory.dmp

Filesize
64KB

Download
memory/1536-133-0x00007FFF6D450000-0x00007FFF6D460000-memory.dmp

Filesize
64KB

Download
memory/1536-132-0x00007FFF6D450000-0x00007FFF6D460000-memory.dmp

Filesize
64KB

Download
memory/1536-131-0x00007FFF6D450000-0x00007FFF6D460000-memory.dmp

Filesize
64KB

Download
memory/2000-155-0x0000000004BA1000-0x0000000004BC5000-memory.dmp

Filesize
144KB

Download
memory/2000-156-0x0000000004BC5000-0x0000000004BC6000-memory.dmp

Filesize
4KB

Download
memory/3404-171-0x0000000004D11000-0x0000000004D35000-memory.dmp

Filesize
144KB

Download
memory/3404-167-0x0000000004B91000-0x0000000004BB5000-memory.dmp

Filesize
144KB

Download
memory/3404-165-0x0000000004B31000-0x0000000004B55000-memory.dmp

Filesize
144KB

Download
memory/3404-163-0x0000000004A21000-0x0000000004A45000-memory.dmp

Filesize
144KB

Download
memory/3404-161-0x0000000004941000-0x0000000004965000-memory.dmp

Filesize
144KB

Download
memory/3404-159-0x00000000043E1000-0x0000000004405000-memory.dmp

Filesize
144KB

Download
memory/3988-172-0x0000000000791000-0x00000000007B5000-memory.dmp

Filesize
144KB

Download