nloader | 056809e596895320397378f7f3ff4958107e48f4890a960229dcfbc32b7379b7

General

Target

subscription_1616167805.xlsb
Size

328KB
MD5

d17e780a23c19a5ce5c2a0d4abc19b55
SHA1

d3d73e9f08cb6d880dc163149d352a197dac7300
SHA256

056809e596895320397378f7f3ff4958107e48f4890a960229dcfbc32b7379b7
SHA512

df94d5473166e9d73ee27a37793fa3bbdee409692cee61696b3dd7bf79c3604da14a09a7e27becf17fd59ab267fd8f6548026b7d5da232253800f0ee94602cab

Score

10^/10

nloader loader

Malware Config

Extracted

Language

xlm4.0

Source

Signatures

Nloader
Simple loader that includes the keyword 'cambo' 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	1792	2044	cmd.exe	24

Nloader Payload 4 IoCs

resource	yara_rule
behavioral1/memory/748-14-0x0000000000130000-0x0000000000139000-memory.dmp	nloader
behavioral1/memory/748-15-0x0000000010000000-0x0000000010007000-memory.dmp	nloader
behavioral1/memory/748-16-0x0000000000150000-0x0000000000155000-memory.dmp	nloader
behavioral1/memory/748-17-0x0000000000120000-0x0000000000126000-memory.dmp	nloader

Blocklisted process makes network request 2 IoCs

flow	pid	Process
3	748	rundll32.exe
5	748	rundll32.exe

Executes dropped EXE 1 IoCs

pid	Process
696	klga.exe

Loads dropped DLL 3 IoCs

pid	Process
748	rundll32.exe
748	rundll32.exe
748	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-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\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-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2044	EXCEL.EXE

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2044	EXCEL.EXE
2044	EXCEL.EXE
2044	EXCEL.EXE

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2044 wrote to memory of 1792	2044	EXCEL.EXE	27
PID 2044 wrote to memory of 1792	2044	EXCEL.EXE	27
PID 2044 wrote to memory of 1792	2044	EXCEL.EXE	27
PID 2044 wrote to memory of 1792	2044	EXCEL.EXE	27
PID 1792 wrote to memory of 1768	1792	cmd.exe	29
PID 1792 wrote to memory of 1768	1792	cmd.exe	29
PID 1792 wrote to memory of 1768	1792	cmd.exe	29
PID 1792 wrote to memory of 1768	1792	cmd.exe	29
PID 1792 wrote to memory of 748	1792	cmd.exe	30
PID 1792 wrote to memory of 748	1792	cmd.exe	30
PID 1792 wrote to memory of 748	1792	cmd.exe	30
PID 1792 wrote to memory of 748	1792	cmd.exe	30
PID 1792 wrote to memory of 748	1792	cmd.exe	30
PID 1792 wrote to memory of 748	1792	cmd.exe	30
PID 1792 wrote to memory of 748	1792	cmd.exe	30
PID 748 wrote to memory of 696	748	rundll32.exe	35
PID 748 wrote to memory of 696	748	rundll32.exe	35
PID 748 wrote to memory of 696	748	rundll32.exe	35
PID 748 wrote to memory of 696	748	rundll32.exe	35

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_1616167805.xlsb
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2044
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c certutil -f -decode C:\Users\Public\1171.d0 C:\Users\Public\1171.0 && rundll32 C:\Users\Public\1171.0,DF
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:1792
- - C:\Windows\SysWOW64\certutil.exe
    certutil -f -decode C:\Users\Public\1171.d0 C:\Users\Public\1171.0
    3⤵
    PID:1768
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32 C:\Users\Public\1171.0,DF
    3⤵
    - Blocklisted process makes network request
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:748
  - - C:\ProgramData\klga\klga.exe
      "C:\ProgramData\klga\klga.exe"
      4⤵
      Executes dropped EXE
      PID:696

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/748-15-0x0000000010000000-0x0000000010007000-memory.dmp

Filesize
28KB

Download
memory/748-14-0x0000000000130000-0x0000000000139000-memory.dmp

Filesize
36KB

Download
memory/748-16-0x0000000000150000-0x0000000000155000-memory.dmp

Filesize
20KB

Download
memory/748-17-0x0000000000120000-0x0000000000126000-memory.dmp

Filesize
24KB

Download
memory/1768-8-0x0000000075251000-0x0000000075253000-memory.dmp

Filesize
8KB

Download
memory/1772-5-0x000007FEF77C0000-0x000007FEF7A3A000-memory.dmp

Filesize
2.5MB

Download
memory/2044-2-0x000000002F081000-0x000000002F084000-memory.dmp

Filesize
12KB

Download
memory/2044-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/2044-3-0x0000000071671000-0x0000000071673000-memory.dmp

Filesize
8KB

Download

Analysis

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