bb32c9472ef2faeae273e266c7fd2dd749d5b200affe3e0e3d3cbacd4cf6e904

General

Target
79ac0e95634248aedd3c8065c4b38256.xls
Size 118KB
Sample220111-3qkeeaaag2
SHA256 bb32c9472ef2faeae273e266c7fd2dd749d5b200affe3e0e3d3cbacd4cf6e904
MD5 79ac0e95634248aedd3c8065c4b38256
SHA1 55920103351780c7d04deb69199d88897de44874
SHA512 c6accfeaf58ff7bb762e80ad5a0c4d251f74fd1342b6dda68c08ca40bdb1c69c0272fa8cbd79632723b170296b090680c04ebfa4e1f3e9ea83444c6d46de43c9
MD5 SHA1 SHA512

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper
http://www.cuneytkocas.com/wp-content/VSnofpES1wO2CcVob/

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	2592	3496	rundll32.exe	68

Blocklisted process makes network request 1 IoCs

flow	pid	Process
43	3772	rundll32.exe

Downloads MZ/PE file

Loads dropped DLL 2 IoCs

pid	Process
2592	rundll32.exe
3812	rundll32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Tfbiysxr\keyfncip.rmo	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
3496	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3772	rundll32.exe
3772	rundll32.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
3496	EXCEL.EXE
3496	EXCEL.EXE
3496	EXCEL.EXE
3496	EXCEL.EXE
3496	EXCEL.EXE
3496	EXCEL.EXE
3496	EXCEL.EXE
3496	EXCEL.EXE
3496	EXCEL.EXE
3496	EXCEL.EXE
3496	EXCEL.EXE
3496	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3496 wrote to memory of 2592	3496	EXCEL.EXE	70
PID 3496 wrote to memory of 2592	3496	EXCEL.EXE	70
PID 3496 wrote to memory of 2592	3496	EXCEL.EXE	70
PID 2592 wrote to memory of 3812	2592	rundll32.exe	73
PID 2592 wrote to memory of 3812	2592	rundll32.exe	73
PID 2592 wrote to memory of 3812	2592	rundll32.exe	73
PID 3812 wrote to memory of 3912	3812	rundll32.exe	74
PID 3812 wrote to memory of 3912	3812	rundll32.exe	74
PID 3812 wrote to memory of 3912	3812	rundll32.exe	74
PID 3912 wrote to memory of 3772	3912	rundll32.exe	75
PID 3912 wrote to memory of 3772	3912	rundll32.exe	75
PID 3912 wrote to memory of 3772	3912	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\79ac0e95634248aedd3c8065c4b38256.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3496
- 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:2592
- - 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:3812
  - - C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Tfbiysxr\keyfncip.rmo",bGzr
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3912
    - - C:\Windows\SysWOW64\rundll32.exe
        
        C:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Tfbiysxr\keyfncip.rmo",DllRegisterServer
        5⤵
        Blocklisted process makes network request
        Suspicious behavior: EnumeratesProcesses
        
        PID:3772

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/3496-118-0x00007FFF65860000-0x00007FFF65870000-memory.dmp

Download

memory/3496-120-0x000001CB2AA50000-0x000001CB2AA52000-memory.dmp

Download

memory/3496-121-0x00007FFF65860000-0x00007FFF65870000-memory.dmp

Download

memory/3496-122-0x000001CB2AA50000-0x000001CB2AA52000-memory.dmp

Download

memory/3496-119-0x000001CB2AA50000-0x000001CB2AA52000-memory.dmp

Download

memory/3496-115-0x00007FFF65860000-0x00007FFF65870000-memory.dmp

Download

memory/3496-117-0x00007FFF65860000-0x00007FFF65870000-memory.dmp

Download

memory/3496-116-0x00007FFF65860000-0x00007FFF65870000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads