c0e91f1caa569816aac5c6dc3fc878ebf80cd72d580e18e1bdafa0835d9504fe

General

Target
e37f1632461e0a2ffea36228f94687ec.xls
Size 118KB
Sample220111-twc3vagce8
SHA256 c0e91f1caa569816aac5c6dc3fc878ebf80cd72d580e18e1bdafa0835d9504fe
MD5 e37f1632461e0a2ffea36228f94687ec
SHA1 3dd67b23a10d023a531e3754ad65d246f65d6d99
SHA512 37ff402e51b5df5f2c073d2880b6199ff5673179e3c4b555df1d5f2bbb1cd7abd5b3d5134981e0caed3894419323f6834b09f86887d41cb7e1faf7c44f84c426
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	2496	2940	rundll32.exe	67

Blocklisted process makes network request 2 IoCs

flow	pid	Process
42	2200	rundll32.exe
43	2200	rundll32.exe

Downloads MZ/PE file

Loads dropped DLL 2 IoCs

pid	Process
2496	rundll32.exe
2464	rundll32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Bhlqkzz\nxsmbiz.oin	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
2940	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2200	rundll32.exe
2200	rundll32.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
2940	EXCEL.EXE
2940	EXCEL.EXE
2940	EXCEL.EXE
2940	EXCEL.EXE
2940	EXCEL.EXE
2940	EXCEL.EXE
2940	EXCEL.EXE
2940	EXCEL.EXE
2940	EXCEL.EXE
2940	EXCEL.EXE
2940	EXCEL.EXE
2940	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2940 wrote to memory of 2496	2940	EXCEL.EXE	71
PID 2940 wrote to memory of 2496	2940	EXCEL.EXE	71
PID 2940 wrote to memory of 2496	2940	EXCEL.EXE	71
PID 2496 wrote to memory of 2464	2496	rundll32.exe	72
PID 2496 wrote to memory of 2464	2496	rundll32.exe	72
PID 2496 wrote to memory of 2464	2496	rundll32.exe	72
PID 2464 wrote to memory of 432	2464	rundll32.exe	73
PID 2464 wrote to memory of 432	2464	rundll32.exe	73
PID 2464 wrote to memory of 432	2464	rundll32.exe	73
PID 432 wrote to memory of 2200	432	rundll32.exe	74
PID 432 wrote to memory of 2200	432	rundll32.exe	74
PID 432 wrote to memory of 2200	432	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\e37f1632461e0a2ffea36228f94687ec.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2940
- 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:2496
- - 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:2464
  - - C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Bhlqkzz\nxsmbiz.oin",GwOQeolMcZ
      4⤵
      Suspicious use of WriteProcessMemory
      PID:432
    - - C:\Windows\SysWOW64\rundll32.exe
        
        C:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Bhlqkzz\nxsmbiz.oin",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

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Downloads

memory/2940-119-0x000002B67EFD0000-0x000002B67EFD2000-memory.dmp

Download

memory/2940-128-0x00007FF7E4E20000-0x00007FF7E4E30000-memory.dmp

Download

memory/2940-129-0x00007FF7E1700000-0x00007FF7E1710000-memory.dmp

Download

memory/2940-127-0x00007FF7E1700000-0x00007FF7E1710000-memory.dmp

Download

memory/2940-121-0x000002B67EFD0000-0x000002B67EFD2000-memory.dmp

Download

memory/2940-120-0x000002B67EFD0000-0x000002B67EFD2000-memory.dmp

Download

memory/2940-115-0x00007FF7E4E20000-0x00007FF7E4E30000-memory.dmp

Download

memory/2940-118-0x00007FF7E4E20000-0x00007FF7E4E30000-memory.dmp

Download

memory/2940-117-0x00007FF7E4E20000-0x00007FF7E4E30000-memory.dmp

Download

memory/2940-116-0x00007FF7E4E20000-0x00007FF7E4E30000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads