9130d8068b2ef10c7127ddbc23715591e0bd026c0ce94a36c26d92b99ee8e524

General

Target
SecuriteInfo.com.Heur.32655.13366.xlsm
Size 84KB
Sample220111-zyay6ahcd3
SHA256 9130d8068b2ef10c7127ddbc23715591e0bd026c0ce94a36c26d92b99ee8e524
MD5 7ff9d364c6aa2bf96f20f54abf0da649
SHA1 d7bb9bcc528d6902ea114cf84af02a324c33b5a3
SHA512 57ad91873231f1dff7162fdeef24b897c42f611fd3b6e0cc870c809d6f15a1d6051c68dd57577eba241bc000eb7e818049fc16da98f1d924da04a3c5ce89f8a4
MD5 SHA1 SHA512

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper
http://yuanbinglun.com/www.yuanbinglun.com/L6kV1Jp9JInnxmaw5/

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	3772	2736	rundll32.exe	67

Blocklisted process makes network request 2 IoCs

flow	pid	Process
45	1808	rundll32.exe
46	1808	rundll32.exe

Downloads MZ/PE file

Loads dropped DLL 2 IoCs

pid	Process
3772	rundll32.exe
956	rundll32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Rgnafhv\kzmtwrjhnyevtny.qaq	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
2736	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1808	rundll32.exe
1808	rundll32.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
2736	EXCEL.EXE
2736	EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
2736	EXCEL.EXE
2736	EXCEL.EXE
2736	EXCEL.EXE
2736	EXCEL.EXE
2736	EXCEL.EXE
2736	EXCEL.EXE
2736	EXCEL.EXE
2736	EXCEL.EXE
2736	EXCEL.EXE
2736	EXCEL.EXE
2736	EXCEL.EXE
2736	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2736 wrote to memory of 3772	2736	EXCEL.EXE	71
PID 2736 wrote to memory of 3772	2736	EXCEL.EXE	71
PID 2736 wrote to memory of 3772	2736	EXCEL.EXE	71
PID 3772 wrote to memory of 956	3772	rundll32.exe	72
PID 3772 wrote to memory of 956	3772	rundll32.exe	72
PID 3772 wrote to memory of 956	3772	rundll32.exe	72
PID 956 wrote to memory of 1220	956	rundll32.exe	73
PID 956 wrote to memory of 1220	956	rundll32.exe	73
PID 956 wrote to memory of 1220	956	rundll32.exe	73
PID 1220 wrote to memory of 1808	1220	rundll32.exe	74
PID 1220 wrote to memory of 1808	1220	rundll32.exe	74
PID 1220 wrote to memory of 1808	1220	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\SecuriteInfo.com.Heur.32655.13366.xlsm"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2736
- C:\Windows\SysWow64\rundll32.exe
  C:\Windows\SysWow64\rundll32.exe ..\adi.ocx,D"&"l"&"lR"&"egister"&"Serve"&"r
  2⤵
  - Process spawned unexpected child process
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:3772
- - C:\Windows\SysWOW64\rundll32.exe
    C:\Windows\SysWOW64\rundll32.exe "C:\Users\Admin\adi.ocx",DllRegisterServer
    3⤵
    - Loads dropped DLL
    - Drops file in System32 directory
    - Suspicious use of WriteProcessMemory
    PID:956
  - - C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Rgnafhv\kzmtwrjhnyevtny.qaq",SGUUFnXBDr
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1220
    - - C:\Windows\SysWOW64\rundll32.exe
        
        C:\Windows\SysWOW64\rundll32.exe "C:\Windows\System32\Rgnafhv\kzmtwrjhnyevtny.qaq",DllRegisterServer
        5⤵
        Blocklisted process makes network request
        Suspicious behavior: EnumeratesProcesses
        
        PID:1808

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/2736-118-0x00007FFDCF190000-0x00007FFDCF1A0000-memory.dmp

Download

memory/2736-122-0x000001B94A5D0000-0x000001B94A5D2000-memory.dmp

Download

memory/2736-121-0x00007FFDCF190000-0x00007FFDCF1A0000-memory.dmp

Download

memory/2736-120-0x000001B94A5D0000-0x000001B94A5D2000-memory.dmp

Download

memory/2736-119-0x000001B94A5D0000-0x000001B94A5D2000-memory.dmp

Download

memory/2736-115-0x00007FFDCF190000-0x00007FFDCF1A0000-memory.dmp

Download

memory/2736-117-0x00007FFDCF190000-0x00007FFDCF1A0000-memory.dmp

Download

memory/2736-116-0x00007FFDCF190000-0x00007FFDCF1A0000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads