nloader | ae6dbc08e0e21b217352175f916cfd5269c4fd8d5de6bff2d0a93a366f78e8d1

General

Target

subscription_1617056233.xlsb
Size

177KB
MD5

1d1ba411ff36cdd1b1350341624ac008
SHA1

becdec14b92c6d67b3aa28fdbf4293dabb7b0055
SHA256

ae6dbc08e0e21b217352175f916cfd5269c4fd8d5de6bff2d0a93a366f78e8d1
SHA512

89a9df6e41300e05c71af3eb45acd7cd6c3915bc511d00cc2a420c5d3a274a704798b3e48e93ffccd7813ee2a25e96a2c1c1f4d1e84ed86c144f2e79af501ef0

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 2 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	1232	788	cmd.exe	24
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1820	788	rundll32.exe	24

Nloader Payload 4 IoCs

resource	yara_rule
behavioral1/memory/1820-71-0x0000000000200000-0x0000000000209000-memory.dmp	nloader
behavioral1/memory/1820-74-0x0000000000210000-0x0000000000217000-memory.dmp	nloader
behavioral1/memory/1820-77-0x0000000000230000-0x0000000000235000-memory.dmp	nloader
behavioral1/memory/1820-79-0x0000000000160000-0x0000000000166000-memory.dmp	nloader

Blocklisted process makes network request 1 IoCs

flow	pid	Process
4	1820	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
1820	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
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\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-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\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-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
788	EXCEL.EXE

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
788	EXCEL.EXE
788	EXCEL.EXE
788	EXCEL.EXE

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 788 wrote to memory of 1232	788	EXCEL.EXE	27
PID 788 wrote to memory of 1232	788	EXCEL.EXE	27
PID 788 wrote to memory of 1232	788	EXCEL.EXE	27
PID 788 wrote to memory of 1232	788	EXCEL.EXE	27
PID 1232 wrote to memory of 1228	1232	cmd.exe	29
PID 1232 wrote to memory of 1228	1232	cmd.exe	29
PID 1232 wrote to memory of 1228	1232	cmd.exe	29
PID 1232 wrote to memory of 1228	1232	cmd.exe	29
PID 788 wrote to memory of 1820	788	EXCEL.EXE	33
PID 788 wrote to memory of 1820	788	EXCEL.EXE	33
PID 788 wrote to memory of 1820	788	EXCEL.EXE	33
PID 788 wrote to memory of 1820	788	EXCEL.EXE	33
PID 788 wrote to memory of 1820	788	EXCEL.EXE	33
PID 788 wrote to memory of 1820	788	EXCEL.EXE	33
PID 788 wrote to memory of 1820	788	EXCEL.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_1617056233.xlsb
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:788
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c certutil -decode %PUBLIC%\4123.xsg %PUBLIC%\4123.do1
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:1232
- - C:\Windows\SysWOW64\certutil.exe
    certutil -decode C:\Users\Public\4123.xsg C:\Users\Public\4123.do1
    3⤵
    PID:1228
- C:\Windows\SysWOW64\rundll32.exe
  rundll32 C:\Users\Public\4123.do1,DF1
  2⤵
  - Process spawned unexpected child process
  - Blocklisted process makes network request
  - Loads dropped DLL
  PID:1820

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/788-61-0x0000000071391000-0x0000000071393000-memory.dmp

Filesize
8KB

Download
memory/788-62-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/788-80-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/788-60-0x000000002F7D1000-0x000000002F7D4000-memory.dmp

Filesize
12KB

Download
memory/1228-65-0x0000000075551000-0x0000000075553000-memory.dmp

Filesize
8KB

Download
memory/1820-71-0x0000000000200000-0x0000000000209000-memory.dmp

Filesize
36KB

Download
memory/1820-74-0x0000000000210000-0x0000000000217000-memory.dmp

Filesize
28KB

Download
memory/1820-76-0x0000000000213000-0x0000000000214000-memory.dmp

Filesize
4KB

Download
memory/1820-77-0x0000000000230000-0x0000000000235000-memory.dmp

Filesize
20KB

Download
memory/1820-79-0x0000000000160000-0x0000000000166000-memory.dmp

Filesize
24KB

Download

Analysis

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