nloader | 5c2c97f89704c710ed1638074c98d42c9d1ff1f53e25cdcd3ffd72d231f7480b

General

Target

subscription_1618416583.xlsb
Size

254KB
MD5

664872d6a7739069e1357f0a0c6d7dd2
SHA1

02b1c506e304053d5af55eb7831657eff247067a
SHA256

5c2c97f89704c710ed1638074c98d42c9d1ff1f53e25cdcd3ffd72d231f7480b
SHA512

9c9656373ff41dec29c83ab15140288ea6f473b17c1bfde0cbc2900d7269c63786e09b257a16ad8e6fe7e8ab64eacf8011d5d7b214a18fac3b692d84c98cd65c

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.

description	pid	pid_target	Process	procid_target
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	864	1820	cmd.exe	24

Nloader Payload 4 IoCs

resource	yara_rule
behavioral1/memory/556-77-0x0000000000150000-0x0000000000155000-memory.dmp	nloader
behavioral1/memory/556-74-0x0000000000130000-0x0000000000137000-memory.dmp	nloader
behavioral1/memory/556-71-0x0000000000120000-0x0000000000129000-memory.dmp	nloader
behavioral1/memory/556-79-0x0000000000110000-0x0000000000116000-memory.dmp	nloader

Blocklisted process makes network request 1 IoCs

flow	pid	Process
6	556	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
556	rundll32.exe

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

T1012

System Information Discovery

T1082

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

description	ioc	Process
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 (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 (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
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1820	EXCEL.EXE

Suspicious use of SetWindowsHookEx 5 IoCs

pid	Process
1820	EXCEL.EXE
1820	EXCEL.EXE
1820	EXCEL.EXE
1820	EXCEL.EXE
1820	EXCEL.EXE

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1820 wrote to memory of 864	1820	EXCEL.EXE	30
PID 1820 wrote to memory of 864	1820	EXCEL.EXE	30
PID 1820 wrote to memory of 864	1820	EXCEL.EXE	30
PID 1820 wrote to memory of 864	1820	EXCEL.EXE	30
PID 864 wrote to memory of 1636	864	cmd.exe	32
PID 864 wrote to memory of 1636	864	cmd.exe	32
PID 864 wrote to memory of 1636	864	cmd.exe	32
PID 864 wrote to memory of 1636	864	cmd.exe	32
PID 864 wrote to memory of 556	864	cmd.exe	33
PID 864 wrote to memory of 556	864	cmd.exe	33
PID 864 wrote to memory of 556	864	cmd.exe	33
PID 864 wrote to memory of 556	864	cmd.exe	33
PID 864 wrote to memory of 556	864	cmd.exe	33
PID 864 wrote to memory of 556	864	cmd.exe	33
PID 864 wrote to memory of 556	864	cmd.exe	33

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_1618416583.xlsb
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1820
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c certutil -decode %PUBLIC%\130486.dot %PUBLIC%\130486.pgj && rundll32 %PUBLIC%\130486.pgj,DF1
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:864
- - C:\Windows\SysWOW64\certutil.exe
    certutil -decode C:\Users\Public\130486.dot C:\Users\Public\130486.pgj
    3⤵
    PID:1636
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32 C:\Users\Public\130486.pgj,DF1
    3⤵
    - Blocklisted process makes network request
    - Loads dropped DLL
    PID:556

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

Replay Monitor

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Downloads

memory/556-74-0x0000000000130000-0x0000000000137000-memory.dmp

Filesize
28KB

Download
memory/556-77-0x0000000000150000-0x0000000000155000-memory.dmp

Filesize
20KB

Download
memory/556-76-0x0000000000133000-0x0000000000134000-memory.dmp

Filesize
4KB

Download
memory/556-71-0x0000000000120000-0x0000000000129000-memory.dmp

Filesize
36KB

Download
memory/556-79-0x0000000000110000-0x0000000000116000-memory.dmp

Filesize
24KB

Download
memory/1636-65-0x0000000076641000-0x0000000076643000-memory.dmp

Filesize
8KB

Download
memory/1820-62-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1820-61-0x00000000716D1000-0x00000000716D3000-memory.dmp

Filesize
8KB

Download
memory/1820-60-0x000000002F141000-0x000000002F144000-memory.dmp

Filesize
12KB

Download
memory/1820-80-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download

Analysis

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