2f80ecbe8f3eb45c354fb36640dc4be6b13064be8550f2d49e41090e5c113b72

General

Target
a8bf3641c46be3f0accc6b55370ecf29.xls
Size 118KB
Sample220111-tvsrxagcd9
SHA256 2f80ecbe8f3eb45c354fb36640dc4be6b13064be8550f2d49e41090e5c113b72
MD5 a8bf3641c46be3f0accc6b55370ecf29
SHA1 2d27136a9386f1344b3a024fdb75bc37d20b4b03
SHA512 9246ec52068719072e845bba595e3a296ee46828a19eddda0c9736f149ef666e39a37838e305f1071fd20db522c39c245e7351eb44672ecd1245ead990bc75b5
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	4084	3336	rundll32.exe	67

Blocklisted process makes network request 2 IoCs

flow	pid	Process
49	4836	rundll32.exe
50	4836	rundll32.exe

Downloads MZ/PE file

Loads dropped DLL 2 IoCs

pid	Process
4084	rundll32.exe
4804	rundll32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Lcnxnnqqebycqzfp\pyuhdiwq.xqu	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	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
3336	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4836	rundll32.exe
4836	rundll32.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
3336	EXCEL.EXE
3336	EXCEL.EXE
3336	EXCEL.EXE
3336	EXCEL.EXE
3336	EXCEL.EXE
3336	EXCEL.EXE
3336	EXCEL.EXE
3336	EXCEL.EXE
3336	EXCEL.EXE
3336	EXCEL.EXE
3336	EXCEL.EXE
3336	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3336 wrote to memory of 4084	3336	EXCEL.EXE	71
PID 3336 wrote to memory of 4084	3336	EXCEL.EXE	71
PID 3336 wrote to memory of 4084	3336	EXCEL.EXE	71
PID 4084 wrote to memory of 4804	4084	rundll32.exe	72
PID 4084 wrote to memory of 4804	4084	rundll32.exe	72
PID 4084 wrote to memory of 4804	4084	rundll32.exe	72
PID 4804 wrote to memory of 2216	4804	rundll32.exe	73
PID 4804 wrote to memory of 2216	4804	rundll32.exe	73
PID 4804 wrote to memory of 2216	4804	rundll32.exe	73
PID 2216 wrote to memory of 4836	2216	rundll32.exe	74
PID 2216 wrote to memory of 4836	2216	rundll32.exe	74
PID 2216 wrote to memory of 4836	2216	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\a8bf3641c46be3f0accc6b55370ecf29.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3336
- 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:4084
- - 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:4804
  - - C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Lcnxnnqqebycqzfp\pyuhdiwq.xqu",xQzDpyMmLo
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2216
    - - C:\Windows\SysWOW64\rundll32.exe
        
        C:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Lcnxnnqqebycqzfp\pyuhdiwq.xqu",DllRegisterServer
        5⤵
        Blocklisted process makes network request
        Suspicious behavior: EnumeratesProcesses
        
        PID:4836

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/3336-118-0x00007FFBBFC80000-0x00007FFBBFC90000-memory.dmp

Download

memory/3336-119-0x0000016E2CC50000-0x0000016E2CC52000-memory.dmp

Download

memory/3336-121-0x0000016E2CC50000-0x0000016E2CC52000-memory.dmp

Download

memory/3336-127-0x00007FFBBFC80000-0x00007FFBBFC90000-memory.dmp

Download

memory/3336-120-0x0000016E2CC50000-0x0000016E2CC52000-memory.dmp

Download

memory/3336-115-0x00007FFBBFC80000-0x00007FFBBFC90000-memory.dmp

Download

memory/3336-117-0x00007FFBBFC80000-0x00007FFBBFC90000-memory.dmp

Download

memory/3336-116-0x00007FFBBFC80000-0x00007FFBBFC90000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads