2cb32cce5af951f826a1a62921237a45f2734472193d1e7ef2285c566b44dc3b

General

Target
2cb32cce5af951f826a1a62921237a45f2734472193d1e7ef2285c566b44dc3b.xlsm
Size 83KB
Sample220114-jqfxfafac3
SHA256 2cb32cce5af951f826a1a62921237a45f2734472193d1e7ef2285c566b44dc3b
MD5 d944b0a628997eb33dd8ba21785421b5
SHA1 fb839bbf5a3f812cf37016dc2be0d447572c90db
SHA512 3eb3ac55f9910a4da4c0289eb75b78646a2bbbc6878adeab8de8ae97071dd5cc3e1df18a4cb054c3316d0fb58ef5138c10c2163b3bf65c456f752d3f5e616057
MD5 SHA1 SHA512

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper
http://therecyclingmachine.com/wp-admin/LzpOZSlkq90fYT1/

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	3608	3796	rundll32.exe	68

Blocklisted process makes network request 2 IoCs

flow	pid	Process
44	1176	rundll32.exe
45	1176	rundll32.exe

Downloads MZ/PE file

Loads dropped DLL 2 IoCs

pid	Process
3608	rundll32.exe
2204	rundll32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Nfeinyxg\sammrthm.lfd	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
3796	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1176	rundll32.exe
1176	rundll32.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
3796	EXCEL.EXE
3796	EXCEL.EXE
3796	EXCEL.EXE
3796	EXCEL.EXE
3796	EXCEL.EXE
3796	EXCEL.EXE
3796	EXCEL.EXE
3796	EXCEL.EXE
3796	EXCEL.EXE
3796	EXCEL.EXE
3796	EXCEL.EXE
3796	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3796 wrote to memory of 3608	3796	EXCEL.EXE	72
PID 3796 wrote to memory of 3608	3796	EXCEL.EXE	72
PID 3796 wrote to memory of 3608	3796	EXCEL.EXE	72
PID 3608 wrote to memory of 2204	3608	rundll32.exe	73
PID 3608 wrote to memory of 2204	3608	rundll32.exe	73
PID 3608 wrote to memory of 2204	3608	rundll32.exe	73
PID 2204 wrote to memory of 4020	2204	rundll32.exe	74
PID 2204 wrote to memory of 4020	2204	rundll32.exe	74
PID 2204 wrote to memory of 4020	2204	rundll32.exe	74
PID 4020 wrote to memory of 1176	4020	rundll32.exe	75
PID 4020 wrote to memory of 1176	4020	rundll32.exe	75
PID 4020 wrote to memory of 1176	4020	rundll32.exe	75

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\2cb32cce5af951f826a1a62921237a45f2734472193d1e7ef2285c566b44dc3b.xlsm"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3796
- 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:3608
- - 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:2204
  - - C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Nfeinyxg\sammrthm.lfd",REtKb
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4020
    - - C:\Windows\SysWOW64\rundll32.exe
        
        C:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Nfeinyxg\sammrthm.lfd",DllRegisterServer
        5⤵
        Blocklisted process makes network request
        Suspicious behavior: EnumeratesProcesses
        
        PID:1176

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/3796-119-0x00007FF93ACF0000-0x00007FF93AD00000-memory.dmp

Download

memory/3796-122-0x000002A2D26C0000-0x000002A2D26C2000-memory.dmp

Download

memory/3796-128-0x00007FF937180000-0x00007FF937190000-memory.dmp

Download

memory/3796-129-0x00007FF937180000-0x00007FF937190000-memory.dmp

Download

memory/3796-121-0x000002A2D26C0000-0x000002A2D26C2000-memory.dmp

Download

memory/3796-120-0x000002A2D26C0000-0x000002A2D26C2000-memory.dmp

Download

memory/3796-115-0x00007FF93ACF0000-0x00007FF93AD00000-memory.dmp

Download

memory/3796-118-0x00007FF93ACF0000-0x00007FF93AD00000-memory.dmp

Download

memory/3796-117-0x00007FF93ACF0000-0x00007FF93AD00000-memory.dmp

Download

memory/3796-116-0x00007FF93ACF0000-0x00007FF93AD00000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads