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 (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	456	760	cmd.exe	EXCEL.EXE

Nloader Payload 1 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1588-70-0x00000000000D0000-0x00000000000D5000-memory.dmp	nloader

Loads dropped DLL 1 IoCs

Processes:

rundll32.exe

pid process

1588 rundll32.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

436 1588 WerFault.exe rundll32.exe
Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

EXCEL.EXE

description ioc process

Key opened \REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor EXCEL.EXE

pid	process
1588	rundll32.exe

pid	pid_target	process	target process
436	1588	WerFault.exe	rundll32.exe

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

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

EXCEL.EXE

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

760 EXCEL.EXE
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

WerFault.exe

pid process

436 WerFault.exe
436 WerFault.exe
436 WerFault.exe
436 WerFault.exe
436 WerFault.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

WerFault.exe

description pid process

Token: SeDebugPrivilege 436 WerFault.exe
Suspicious use of SetWindowsHookEx 7 IoCs

Processes:

EXCEL.EXE

pid process

760 EXCEL.EXE
760 EXCEL.EXE
760 EXCEL.EXE
760 EXCEL.EXE
760 EXCEL.EXE
760 EXCEL.EXE
760 EXCEL.EXE

pid	process
760	EXCEL.EXE

pid	process
436	WerFault.exe
436	WerFault.exe
436	WerFault.exe
436	WerFault.exe
436	WerFault.exe

description	pid	process
Token: SeDebugPrivilege	436	WerFault.exe

pid	process
760	EXCEL.EXE
760	EXCEL.EXE
760	EXCEL.EXE
760	EXCEL.EXE
760	EXCEL.EXE
760	EXCEL.EXE
760	EXCEL.EXE

Suspicious use of WriteProcessMemory 19 IoCs

Processes:

EXCEL.EXEcmd.exerundll32.exe

description	pid	process	target process
PID 760 wrote to memory of 456	760	EXCEL.EXE	cmd.exe
PID 760 wrote to memory of 456	760	EXCEL.EXE	cmd.exe
PID 760 wrote to memory of 456	760	EXCEL.EXE	cmd.exe
PID 760 wrote to memory of 456	760	EXCEL.EXE	cmd.exe
PID 456 wrote to memory of 1432	456	cmd.exe	certutil.exe
PID 456 wrote to memory of 1432	456	cmd.exe	certutil.exe
PID 456 wrote to memory of 1432	456	cmd.exe	certutil.exe
PID 456 wrote to memory of 1432	456	cmd.exe	certutil.exe
PID 456 wrote to memory of 1588	456	cmd.exe	rundll32.exe
PID 456 wrote to memory of 1588	456	cmd.exe	rundll32.exe
PID 456 wrote to memory of 1588	456	cmd.exe	rundll32.exe
PID 456 wrote to memory of 1588	456	cmd.exe	rundll32.exe
PID 456 wrote to memory of 1588	456	cmd.exe	rundll32.exe
PID 456 wrote to memory of 1588	456	cmd.exe	rundll32.exe
PID 456 wrote to memory of 1588	456	cmd.exe	rundll32.exe
PID 1588 wrote to memory of 436	1588	rundll32.exe	WerFault.exe
PID 1588 wrote to memory of 436	1588	rundll32.exe	WerFault.exe
PID 1588 wrote to memory of 436	1588	rundll32.exe	WerFault.exe
PID 1588 wrote to memory of 436	1588	rundll32.exe	WerFault.exe

C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\subscription_1617291613.xlsb
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:760
- C:\Windows\SysWOW64\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:456
- - C:\Windows\SysWOW64\certutil.exe
    certutil -decode C:\Users\Public\569390.pdi C:\Users\Public\569390.ui
    3⤵
    PID:1432
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32 C:\Users\Public\569390.ui,DF1
    3⤵
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:1588
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1588 -s 432
      4⤵
      Program crash
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:436

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

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/436-71-0x0000000000000000-mapping.dmp

Download
memory/436-72-0x0000000000590000-0x0000000000591000-memory.dmp

Filesize
4KB

Download
memory/456-62-0x0000000000000000-mapping.dmp

Download
memory/760-61-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/760-60-0x0000000070D41000-0x0000000070D43000-memory.dmp

Filesize
8KB

Download
memory/760-59-0x000000002F391000-0x000000002F394000-memory.dmp

Filesize
12KB

Download
memory/760-73-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1432-63-0x0000000000000000-mapping.dmp

Download
memory/1432-64-0x0000000075051000-0x0000000075053000-memory.dmp

Filesize
8KB

Download
memory/1588-66-0x0000000000000000-mapping.dmp

Download
memory/1588-70-0x00000000000D0000-0x00000000000D5000-memory.dmp

Filesize
20KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads