361e7457bfd87680419fd11b82e2c11ba668205e8421b38cfcb7e879e5267dda

General

Target
5c1e943fd50beef2e697528c8e0da3c8.xls
Size 118KB
Sample220111-rwallsgbhl
SHA256 361e7457bfd87680419fd11b82e2c11ba668205e8421b38cfcb7e879e5267dda
MD5 5c1e943fd50beef2e697528c8e0da3c8
SHA1 289a4b9c7796a8b3f06d6520a3e9532139e37426
SHA512 5d3954504d566ce2ac645546f212ab553e8e67dd0446139e8bd5b6f5a03f6d5ef2c0393c681b4579e84498f5d24e24966a7709df34858b09594f1b2e5e569bee
MD5 SHA1 SHA512

Score

10^/10

suricata

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	1896	2480	rundll32.exe	67

suricata: ET MALWARE W32/Emotet CnC Beacon 3
suricata: ET MALWARE W32/Emotet CnC Beacon 3
suricata

Blocklisted process makes network request 2 IoCs

flow	pid	Process
49	2200	rundll32.exe
50	2200	rundll32.exe

Downloads MZ/PE file

Loads dropped DLL 2 IoCs

pid	Process
1896	rundll32.exe
1036	rundll32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Rdrcyv\oaucc.fvv	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
2480	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2200	rundll32.exe
2200	rundll32.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
2480	EXCEL.EXE
2480	EXCEL.EXE
2480	EXCEL.EXE
2480	EXCEL.EXE
2480	EXCEL.EXE
2480	EXCEL.EXE
2480	EXCEL.EXE
2480	EXCEL.EXE
2480	EXCEL.EXE
2480	EXCEL.EXE
2480	EXCEL.EXE
2480	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2480 wrote to memory of 1896	2480	EXCEL.EXE	71
PID 2480 wrote to memory of 1896	2480	EXCEL.EXE	71
PID 2480 wrote to memory of 1896	2480	EXCEL.EXE	71
PID 1896 wrote to memory of 1036	1896	rundll32.exe	72
PID 1896 wrote to memory of 1036	1896	rundll32.exe	72
PID 1896 wrote to memory of 1036	1896	rundll32.exe	72
PID 1036 wrote to memory of 1348	1036	rundll32.exe	73
PID 1036 wrote to memory of 1348	1036	rundll32.exe	73
PID 1036 wrote to memory of 1348	1036	rundll32.exe	73
PID 1348 wrote to memory of 2200	1348	rundll32.exe	74
PID 1348 wrote to memory of 2200	1348	rundll32.exe	74
PID 1348 wrote to memory of 2200	1348	rundll32.exe	74

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\5c1e943fd50beef2e697528c8e0da3c8.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2480
- 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:1896
- - 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:1036
  - - C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Rdrcyv\oaucc.fvv",lxzcFKKm
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1348
    - - C:\Windows\SysWOW64\rundll32.exe
        
        C:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Rdrcyv\oaucc.fvv",DllRegisterServer
        5⤵
        Blocklisted process makes network request
        Suspicious behavior: EnumeratesProcesses
        
        PID:2200

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

Replay Monitor

Loading Replay Monitor...

Downloads

memory/2480-118-0x00007FF879910000-0x00007FF879920000-memory.dmp

Download

memory/2480-127-0x00007FF879910000-0x00007FF879920000-memory.dmp

Download

memory/2480-121-0x0000017855840000-0x0000017855842000-memory.dmp

Download

memory/2480-120-0x0000017855840000-0x0000017855842000-memory.dmp

Download

memory/2480-119-0x0000017855840000-0x0000017855842000-memory.dmp

Download

memory/2480-115-0x00007FF879910000-0x00007FF879920000-memory.dmp

Download

memory/2480-117-0x00007FF879910000-0x00007FF879920000-memory.dmp

Download

memory/2480-116-0x00007FF879910000-0x00007FF879920000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads