nloader | 42194301fff8d304d7136f5151b1f5262246096a9d0ed3e24fb64e6a1b7ee118

General

Target

subscription_1617291613.xlsb
Size

228KB
MD5

8a3364bafa63166394862068b05f5469
SHA1

b039cb7a479cf118d53c61e113ad74015caadd22
SHA256

3d0b681046147d8008b70bab97c41e3a21a283559874ac2ce0c518b6965312da
SHA512

27c70c7fd278222a17112c0e3deb16a84f36f080a6fd933d51c4cc73392654414991ae0ba99e9760008c40a865572380c03a3b3af9297cb1a3678c630ca18111

Score

10^/10

nloader loader

Malware Config

Extracted

Language

xlm4.0

Source

Signatures

Nloader
Simple loader that includes the keyword 'campo' in the URL used to download other families.
loader nloader

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

cmd.exe

description	pid	pid_target	process	target process
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2304	4036	cmd.exe	EXCEL.EXE

Nloader Payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1304-277-0x0000000003250000-0x0000000003255000-memory.dmp	nloader

Loads dropped DLL 1 IoCs

Processes:

rundll32.exe

pid process

1304 rundll32.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2344 1304 WerFault.exe rundll32.exe

pid	process
1304	rundll32.exe

pid	pid_target	process	target process
2344	1304	WerFault.exe	rundll32.exe

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

Processes:

EXCEL.EXE

description	ioc	process
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
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

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

Processes:

EXCEL.EXE

pid process

4036 EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 15 IoCs

Processes:

WerFault.exe

pid	process
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe
2344	WerFault.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

WerFault.exe

description pid process

Token: SeRestorePrivilege 2344 WerFault.exe
Token: SeBackupPrivilege 2344 WerFault.exe
Token: SeDebugPrivilege 2344 WerFault.exe

description	pid	process
Token: SeRestorePrivilege	2344	WerFault.exe
Token: SeBackupPrivilege	2344	WerFault.exe
Token: SeDebugPrivilege	2344	WerFault.exe

Suspicious use of SetWindowsHookEx 17 IoCs

Processes:

EXCEL.EXE

pid	process
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE
4036	EXCEL.EXE

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

EXCEL.EXEcmd.exerundll32.exe

description	pid	process	target process
PID 4036 wrote to memory of 2304	4036	EXCEL.EXE	cmd.exe
PID 4036 wrote to memory of 2304	4036	EXCEL.EXE	cmd.exe
PID 2304 wrote to memory of 2020	2304	cmd.exe	certutil.exe
PID 2304 wrote to memory of 2020	2304	cmd.exe	certutil.exe
PID 2304 wrote to memory of 3808	2304	cmd.exe	rundll32.exe
PID 2304 wrote to memory of 3808	2304	cmd.exe	rundll32.exe
PID 3808 wrote to memory of 1304	3808	rundll32.exe	rundll32.exe
PID 3808 wrote to memory of 1304	3808	rundll32.exe	rundll32.exe
PID 3808 wrote to memory of 1304	3808	rundll32.exe	rundll32.exe

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\subscription_1617291613.xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4036
- C:\Windows\SYSTEM32\cmd.exe
  cmd.exe /c certutil -decode %PUBLIC%\569390.pdi %PUBLIC%\569390.ui && rundll32 %PUBLIC%\569390.ui,DF1
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:2304
- - C:\Windows\system32\certutil.exe
    certutil -decode C:\Users\Public\569390.pdi C:\Users\Public\569390.ui
    3⤵
    PID:2020
- - C:\Windows\system32\rundll32.exe
    rundll32 C:\Users\Public\569390.ui,DF1
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3808
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32 C:\Users\Public\569390.ui,DF1
      4⤵
      Loads dropped DLL
      PID:1304
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 1304 -s 808
        5⤵
        Program crash
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2344

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Public\569390.pdi

MD5
5cc5f895b91ab4c1835ac9b83e86663b

SHA1
b51565a65b167172b71516435f4118ec9a278673

SHA256
81a75221faf7f28e2b2ce76471499d72b94da9ae48e0e1dc5bf01060e9195065

SHA512
3a4289acdc392d999f4edde46c4261956b9be0aba355dc730a7bee08b9b00dff8733f84c97365aa773fad8bde29aa8dc040aac3067e7af3e7f75049c897e08f0

Download Submit
C:\Users\Public\569390.ui

MD5
f4dc5b1151ed77bfcfae8b73147d93c2

SHA1
e53166ca0f09ad46795cd8f5a1c9a4a2d5b21415

SHA256
71cd6cb93fcf508761b72fac05bc96a07697718eb928c72fc7731dab457b3606

SHA512
077b54dc49c0596ead6b5f754c77deecbda5d7dfee34c21b3d5faab727c8a83804c7da4652597905f5428ab52f2cd10eabbbaae12e30d3a5ccebba0b4ce479eb

Download Submit
\Users\Public\569390.ui

MD5
f4dc5b1151ed77bfcfae8b73147d93c2

SHA1
e53166ca0f09ad46795cd8f5a1c9a4a2d5b21415

SHA256
71cd6cb93fcf508761b72fac05bc96a07697718eb928c72fc7731dab457b3606

SHA512
077b54dc49c0596ead6b5f754c77deecbda5d7dfee34c21b3d5faab727c8a83804c7da4652597905f5428ab52f2cd10eabbbaae12e30d3a5ccebba0b4ce479eb

Download Submit
memory/1304-277-0x0000000003250000-0x0000000003255000-memory.dmp

Filesize
20KB

Download
memory/1304-275-0x0000000000000000-mapping.dmp

Download
memory/2020-271-0x0000000000000000-mapping.dmp

Download
memory/2304-270-0x0000000000000000-mapping.dmp

Download
memory/3808-273-0x0000000000000000-mapping.dmp

Download
memory/4036-116-0x00007FF92CFA0000-0x00007FF92CFB0000-memory.dmp

Filesize
64KB

Download
memory/4036-123-0x00007FF94B280000-0x00007FF94D175000-memory.dmp

Filesize
31.0MB

Download
memory/4036-117-0x00007FF92CFA0000-0x00007FF92CFB0000-memory.dmp

Filesize
64KB

Download
memory/4036-122-0x00007FF94D180000-0x00007FF94E26E000-memory.dmp

Filesize
16.9MB

Download
memory/4036-118-0x00007FF92CFA0000-0x00007FF92CFB0000-memory.dmp

Filesize
64KB

Download
memory/4036-119-0x00007FF92CFA0000-0x00007FF92CFB0000-memory.dmp

Filesize
64KB

Download
memory/4036-115-0x00007FF92CFA0000-0x00007FF92CFB0000-memory.dmp

Filesize
64KB

Download
memory/4036-114-0x00007FF661D00000-0x00007FF6652B6000-memory.dmp

Filesize
53.7MB

Download
memory/4036-303-0x00007FF946B60000-0x00007FF947A2D000-memory.dmp

Filesize
14.8MB

Download
memory/4036-332-0x00007FF92CFA0000-0x00007FF92CFB0000-memory.dmp

Filesize
64KB

Download
memory/4036-333-0x00007FF92CFA0000-0x00007FF92CFB0000-memory.dmp

Filesize
64KB

Download
memory/4036-334-0x00007FF92CFA0000-0x00007FF92CFB0000-memory.dmp

Filesize
64KB

Download
memory/4036-335-0x00007FF92CFA0000-0x00007FF92CFB0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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