dda6bd51ff45aa0e3b4e72d47460f7a78c5bb0bc0f1c43d09a20c88b01b6f851

General

Target
b26ae85e1ae3c86b2a7d7c11390a4113.xls
Size 118KB
Sample220111-s8r7vsgbc7
SHA256 dda6bd51ff45aa0e3b4e72d47460f7a78c5bb0bc0f1c43d09a20c88b01b6f851
MD5 b26ae85e1ae3c86b2a7d7c11390a4113
SHA1 6e5a2d64edc6c498dad3aab12be4d9706e703379
SHA512 5ec3469e3cb429eaf6740349140d8b3fc5a50d41400234e245b1855efffddcbb46b00caf03a1c1b7fe043479b0a38e9a087fe4b5a2b92455a8db60b4a0d46ad8
MD5 SHA1 SHA512

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper
https://wordpressdes.vanzolini-gte.org.br/fundacaotelefonica.org.br/gAbC4QpJYI/

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	2600	3436	rundll32.exe	68

Blocklisted process makes network request 1 IoCs

flow	pid	Process
46	1456	rundll32.exe

Downloads MZ/PE file

Loads dropped DLL 2 IoCs

pid	Process
2600	rundll32.exe
4832	rundll32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Skwlfh\mwvndducmzj.imj	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3436	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1456	rundll32.exe
1456	rundll32.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
3436	EXCEL.EXE
3436	EXCEL.EXE
3436	EXCEL.EXE
3436	EXCEL.EXE
3436	EXCEL.EXE
3436	EXCEL.EXE
3436	EXCEL.EXE
3436	EXCEL.EXE
3436	EXCEL.EXE
3436	EXCEL.EXE
3436	EXCEL.EXE
3436	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3436 wrote to memory of 2600	3436	EXCEL.EXE	72
PID 3436 wrote to memory of 2600	3436	EXCEL.EXE	72
PID 3436 wrote to memory of 2600	3436	EXCEL.EXE	72
PID 2600 wrote to memory of 4832	2600	rundll32.exe	73
PID 2600 wrote to memory of 4832	2600	rundll32.exe	73
PID 2600 wrote to memory of 4832	2600	rundll32.exe	73
PID 4832 wrote to memory of 4980	4832	rundll32.exe	74
PID 4832 wrote to memory of 4980	4832	rundll32.exe	74
PID 4832 wrote to memory of 4980	4832	rundll32.exe	74
PID 4980 wrote to memory of 1456	4980	rundll32.exe	75
PID 4980 wrote to memory of 1456	4980	rundll32.exe	75
PID 4980 wrote to memory of 1456	4980	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\b26ae85e1ae3c86b2a7d7c11390a4113.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3436
- C:\Windows\SysWow64\rundll32.exe
  C:\Windows\SysWow64\rundll32.exe ..\sun.ocx,D"&"l"&"lR"&"egister"&"Serve"&"r
  2⤵
  - Process spawned unexpected child process
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2600
- - C:\Windows\SysWOW64\rundll32.exe
    C:\Windows\SysWOW64\rundll32.exe "C:\Users\Admin\sun.ocx",DllRegisterServer
    3⤵
    - Loads dropped DLL
    - Drops file in System32 directory
    - Suspicious use of WriteProcessMemory
    PID:4832
  - - C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Skwlfh\mwvndducmzj.imj",ytXOS
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4980
    - - C:\Windows\SysWOW64\rundll32.exe
        
        C:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Skwlfh\mwvndducmzj.imj",DllRegisterServer
        5⤵
        Blocklisted process makes network request
        Suspicious behavior: EnumeratesProcesses
        
        PID:1456

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/3436-121-0x00007FFE0CBA0000-0x00007FFE0CBB0000-memory.dmp

Download

memory/3436-123-0x00000211A9DA0000-0x00000211A9DA2000-memory.dmp

Download

memory/3436-125-0x00000211A9DA0000-0x00000211A9DA2000-memory.dmp

Download

memory/3436-124-0x00000211A9DA0000-0x00000211A9DA2000-memory.dmp

Download

memory/3436-122-0x00007FFE0CBA0000-0x00007FFE0CBB0000-memory.dmp

Download

memory/3436-118-0x00007FFE0CBA0000-0x00007FFE0CBB0000-memory.dmp

Download

memory/3436-120-0x00007FFE0CBA0000-0x00007FFE0CBB0000-memory.dmp

Download

memory/3436-119-0x00007FFE0CBA0000-0x00007FFE0CBB0000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads