bazarloader | b48cccd1b5e13f4a531366737c742ebe4c0f9921da9170313f29591a824801b4

Analysis

max time kernel
150s
max time network
19s
platform
windows7_x64
resource
win7v20201028
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

Extracted

Language

xlm4.0

Source

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 (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1672	1068	cmd.exe	24

Bazar/Team9 Loader payload 5 IoCs

resource	yara_rule
behavioral1/memory/792-19-0x0000000001BA0000-0x0000000001BC3000-memory.dmp	BazarLoaderVar1
behavioral1/memory/792-18-0x0000000000430000-0x0000000000455000-memory.dmp	BazarLoaderVar1
behavioral1/memory/792-20-0x00000000001E0000-0x0000000000202000-memory.dmp	BazarLoaderVar1
behavioral1/memory/1384-27-0x0000000001D40000-0x0000000001D63000-memory.dmp	BazarLoaderVar1
behavioral1/memory/2032-37-0x0000000000350000-0x0000000000373000-memory.dmp	BazarLoaderVar1

Nloader Payload 1 IoCs

resource	yara_rule
behavioral1/memory/744-14-0x0000000000150000-0x0000000000155000-memory.dmp	nloader

Blocklisted process makes network request 2 IoCs

flow	pid	Process
3	744	rundll32.exe
4	744	rundll32.exe

Executes dropped EXE 4 IoCs

pid	Process
792	tkqyg.exe
1384	tkqyg.exe
2032	CPPB25E.exe
1172	CPPB25E.exe

Loads dropped DLL 4 IoCs

pid	Process
744	rundll32.exe
744	rundll32.exe
524	cmd.exe
940	cmd.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\MK90GJVY4Y = "cmd.exe /c reg.exe add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run /f /v WYILGH4LL /t REG_SZ /d \"C:\\Users\\Admin\\AppData\\Local\\Temp\\CPPB25E.exe O3PAB\" & start \"H\" C:\\Users\\Admin\\AppData\\Local\\Temp\\CPPB25E.exe O3PAB"	CPPB25E.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-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	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
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	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
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
744	PING.EXE
552	PING.EXE
1328	PING.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1068	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
792	tkqyg.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1068	EXCEL.EXE
1068	EXCEL.EXE
1068	EXCEL.EXE

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 1068 wrote to memory of 1672	1068	EXCEL.EXE	30
PID 1068 wrote to memory of 1672	1068	EXCEL.EXE	30
PID 1068 wrote to memory of 1672	1068	EXCEL.EXE	30
PID 1068 wrote to memory of 1672	1068	EXCEL.EXE	30
PID 1672 wrote to memory of 1496	1672	cmd.exe	32
PID 1672 wrote to memory of 1496	1672	cmd.exe	32
PID 1672 wrote to memory of 1496	1672	cmd.exe	32
PID 1672 wrote to memory of 1496	1672	cmd.exe	32
PID 1672 wrote to memory of 744	1672	cmd.exe	33
PID 1672 wrote to memory of 744	1672	cmd.exe	33
PID 1672 wrote to memory of 744	1672	cmd.exe	33
PID 1672 wrote to memory of 744	1672	cmd.exe	33
PID 1672 wrote to memory of 744	1672	cmd.exe	33
PID 1672 wrote to memory of 744	1672	cmd.exe	33
PID 1672 wrote to memory of 744	1672	cmd.exe	33
PID 744 wrote to memory of 792	744	rundll32.exe	35
PID 744 wrote to memory of 792	744	rundll32.exe	35
PID 744 wrote to memory of 792	744	rundll32.exe	35
PID 744 wrote to memory of 792	744	rundll32.exe	35
PID 792 wrote to memory of 944	792	tkqyg.exe	36
PID 792 wrote to memory of 944	792	tkqyg.exe	36
PID 792 wrote to memory of 944	792	tkqyg.exe	36
PID 944 wrote to memory of 552	944	cmd.exe	38
PID 944 wrote to memory of 552	944	cmd.exe	38
PID 944 wrote to memory of 552	944	cmd.exe	38
PID 944 wrote to memory of 1384	944	cmd.exe	39
PID 944 wrote to memory of 1384	944	cmd.exe	39
PID 944 wrote to memory of 1384	944	cmd.exe	39
PID 1384 wrote to memory of 524	1384	tkqyg.exe	40
PID 1384 wrote to memory of 524	1384	tkqyg.exe	40
PID 1384 wrote to memory of 524	1384	tkqyg.exe	40
PID 524 wrote to memory of 1328	524	cmd.exe	42
PID 524 wrote to memory of 1328	524	cmd.exe	42
PID 524 wrote to memory of 1328	524	cmd.exe	42
PID 524 wrote to memory of 2032	524	cmd.exe	43
PID 524 wrote to memory of 2032	524	cmd.exe	43
PID 524 wrote to memory of 2032	524	cmd.exe	43
PID 2032 wrote to memory of 940	2032	CPPB25E.exe	44
PID 2032 wrote to memory of 940	2032	CPPB25E.exe	44
PID 2032 wrote to memory of 940	2032	CPPB25E.exe	44
PID 940 wrote to memory of 744	940	cmd.exe	46
PID 940 wrote to memory of 744	940	cmd.exe	46
PID 940 wrote to memory of 744	940	cmd.exe	46
PID 940 wrote to memory of 1172	940	cmd.exe	47
PID 940 wrote to memory of 1172	940	cmd.exe	47
PID 940 wrote to memory of 1172	940	cmd.exe	47

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:1068
- 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:1672
- - C:\Windows\SysWOW64\certutil.exe
    certutil -decode C:\Users\Public\569390.pdi C:\Users\Public\569390.ui
    3⤵
    PID:1496
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32 C:\Users\Public\569390.ui,DF1
    3⤵
    - Blocklisted process makes network request
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:744
  - - C:\ProgramData\tkqyg\tkqyg.exe
      "C:\ProgramData\tkqyg\tkqyg.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:792
    - - C:\Windows\system32\cmd.exe
        
        cmd /c ping 8.8.7.7 -n 2 & start C:\ProgramData\tkqyg\tkqyg.exe QB2KET
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:944
      - C:\Windows\system32\PING.EXE
        
        ping 8.8.7.7 -n 2
        6⤵
        Runs ping.exe
        
        PID:552
      - C:\ProgramData\tkqyg\tkqyg.exe
        
        C:\ProgramData\tkqyg\tkqyg.exe QB2KET
        6⤵
        Executes dropped EXE
        Suspicious use of WriteProcessMemory
        
        PID:1384
        
        C:\Windows\system32\cmd.exe
        
        cmd /c ping 8.8.7.7 -n 2 & start C:\Users\Admin\AppData\Local\Temp\CPPB25E.exe MEW1DLD
        7⤵
        Loads dropped DLL
        Suspicious use of WriteProcessMemory
        
        PID:524
        
        C:\Windows\system32\PING.EXE
        
        ping 8.8.7.7 -n 2
        8⤵
        Runs ping.exe
        
        PID:1328
        
        C:\Users\Admin\AppData\Local\Temp\CPPB25E.exe
        
        C:\Users\Admin\AppData\Local\Temp\CPPB25E.exe MEW1DLD
        8⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of WriteProcessMemory
        
        PID:2032
        
        C:\Windows\system32\cmd.exe
        
        cmd /c ping 8.8.7.7 -n 2 & start C:\Users\Admin\AppData\Local\Temp\cPPB25E.exe O3PAB
        9⤵
        Loads dropped DLL
        Suspicious use of WriteProcessMemory
        
        PID:940
        
        C:\Windows\system32\PING.EXE
        
        ping 8.8.7.7 -n 2
        10⤵
        Runs ping.exe
        
        PID:744
        
        C:\Users\Admin\AppData\Local\Temp\CPPB25E.exe
        
        C:\Users\Admin\AppData\Local\Temp\cPPB25E.exe O3PAB
        10⤵
        Executes dropped EXE
        
        PID:1172

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/744-14-0x0000000000150000-0x0000000000155000-memory.dmp

Filesize
20KB

Download
memory/792-19-0x0000000001BA0000-0x0000000001BC3000-memory.dmp

Filesize
140KB

Download
memory/792-20-0x00000000001E0000-0x0000000000202000-memory.dmp

Filesize
136KB

Download
memory/792-18-0x0000000000430000-0x0000000000455000-memory.dmp

Filesize
148KB

Download
memory/1068-3-0x0000000071681000-0x0000000071683000-memory.dmp

Filesize
8KB

Download
memory/1068-2-0x000000002FF01000-0x000000002FF04000-memory.dmp

Filesize
12KB

Download
memory/1068-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1384-27-0x0000000001D40000-0x0000000001D63000-memory.dmp

Filesize
140KB

Download
memory/1496-8-0x00000000756C1000-0x00000000756C3000-memory.dmp

Filesize
8KB

Download
memory/1728-5-0x000007FEF6500000-0x000007FEF677A000-memory.dmp

Filesize
2.5MB

Download
memory/2032-37-0x0000000000350000-0x0000000000373000-memory.dmp

Filesize
140KB

Download