bazarloader | 056809e596895320397378f7f3ff4958107e48f4890a960229dcfbc32b7379b7

Analysis

max time kernel
139s
max time network
134s
platform
windows10_x64
resource
win10v20201028
submitted
19-03-2021 15:42

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General

Target

subscription_1616167805.xlsb
Size

328KB
MD5

d17e780a23c19a5ce5c2a0d4abc19b55
SHA1

d3d73e9f08cb6d880dc163149d352a197dac7300
SHA256

056809e596895320397378f7f3ff4958107e48f4890a960229dcfbc32b7379b7
SHA512

df94d5473166e9d73ee27a37793fa3bbdee409692cee61696b3dd7bf79c3604da14a09a7e27becf17fd59ab267fd8f6548026b7d5da232253800f0ee94602cab

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	3524	3116	cmd.exe	67

Bazar/Team9 Loader payload 1 IoCs

resource	yara_rule
behavioral2/memory/1864-22-0x0000000180000000-0x0000000180023000-memory.dmp	BazarLoaderVar1

Nloader Payload 4 IoCs

resource	yara_rule
behavioral2/memory/3896-14-0x0000000002B30000-0x0000000002B39000-memory.dmp	nloader
behavioral2/memory/3896-15-0x0000000010000000-0x0000000010007000-memory.dmp	nloader
behavioral2/memory/3896-16-0x0000000002BE0000-0x0000000002BE5000-memory.dmp	nloader
behavioral2/memory/3896-17-0x0000000002B20000-0x0000000002B26000-memory.dmp	nloader

Blocklisted process makes network request 2 IoCs

flow	pid	Process
22	3896	rundll32.exe
30	3896	rundll32.exe

Executes dropped EXE 4 IoCs

pid	Process
1864	klga.exe
732	klga.exe
1588	klga.exe
4032	klga.exe

Loads dropped DLL 1 IoCs

pid	Process
3896	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-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	klga.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\DJ1Z41273 = "cmd.exe /c reg.exe add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run /f /v XXGBWZFSP7 /t REG_SZ /d \"C:\\ProgramData\\klga\\klga.exe PKFXLK\" & start \"H\" C:\\ProgramData\\klga\\klga.exe PKFXLK"	klga.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
2892	PING.EXE
2888	PING.EXE
3864	PING.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3116	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1864	klga.exe
1864	klga.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
3116	EXCEL.EXE
3116	EXCEL.EXE
3116	EXCEL.EXE
3116	EXCEL.EXE
3116	EXCEL.EXE
3116	EXCEL.EXE
3116	EXCEL.EXE
3116	EXCEL.EXE
3116	EXCEL.EXE
3116	EXCEL.EXE
3116	EXCEL.EXE
3116	EXCEL.EXE

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 3116 wrote to memory of 3524	3116	EXCEL.EXE	77
PID 3116 wrote to memory of 3524	3116	EXCEL.EXE	77
PID 3524 wrote to memory of 1328	3524	cmd.exe	79
PID 3524 wrote to memory of 1328	3524	cmd.exe	79
PID 3524 wrote to memory of 1816	3524	cmd.exe	80
PID 3524 wrote to memory of 1816	3524	cmd.exe	80
PID 1816 wrote to memory of 3896	1816	rundll32.exe	82
PID 1816 wrote to memory of 3896	1816	rundll32.exe	82
PID 1816 wrote to memory of 3896	1816	rundll32.exe	82
PID 3896 wrote to memory of 1864	3896	rundll32.exe	87
PID 3896 wrote to memory of 1864	3896	rundll32.exe	87
PID 1864 wrote to memory of 3808	1864	klga.exe	88
PID 1864 wrote to memory of 3808	1864	klga.exe	88
PID 3808 wrote to memory of 2892	3808	cmd.exe	90
PID 3808 wrote to memory of 2892	3808	cmd.exe	90
PID 3808 wrote to memory of 732	3808	cmd.exe	91
PID 3808 wrote to memory of 732	3808	cmd.exe	91
PID 732 wrote to memory of 500	732	klga.exe	92
PID 732 wrote to memory of 500	732	klga.exe	92
PID 500 wrote to memory of 2888	500	cmd.exe	94
PID 500 wrote to memory of 2888	500	cmd.exe	94
PID 500 wrote to memory of 1588	500	cmd.exe	95
PID 500 wrote to memory of 1588	500	cmd.exe	95
PID 1588 wrote to memory of 852	1588	klga.exe	96
PID 1588 wrote to memory of 852	1588	klga.exe	96
PID 852 wrote to memory of 3864	852	cmd.exe	98
PID 852 wrote to memory of 3864	852	cmd.exe	98
PID 852 wrote to memory of 4032	852	cmd.exe	99
PID 852 wrote to memory of 4032	852	cmd.exe	99

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_1616167805.xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3116
- C:\Windows\System32\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:3524
- - C:\Windows\system32\certutil.exe
    certutil -f -decode C:\Users\Public\1171.d0 C:\Users\Public\1171.0
    3⤵
    PID:1328
- - C:\Windows\system32\rundll32.exe
    rundll32 C:\Users\Public\1171.0,DF
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1816
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32 C:\Users\Public\1171.0,DF
      4⤵
      Blocklisted process makes network request
      Loads dropped DLL
      Suspicious use of WriteProcessMemory
      PID:3896
    - - C:\ProgramData\klga\klga.exe
        
        "C:\ProgramData\klga\klga.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of WriteProcessMemory
        
        PID:1864
      - C:\Windows\SYSTEM32\cmd.exe
        
        cmd /c ping 8.8.7.7 -n 2 & start C:\ProgramData\klga\klga.exe FJFTZ
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:3808
        
        C:\Windows\system32\PING.EXE
        
        ping 8.8.7.7 -n 2
        7⤵
        Runs ping.exe
        
        PID:2892
        
        C:\ProgramData\klga\klga.exe
        
        C:\ProgramData\klga\klga.exe FJFTZ
        7⤵
        Executes dropped EXE
        Suspicious use of WriteProcessMemory
        
        PID:732
        
        C:\Windows\SYSTEM32\cmd.exe
        
        cmd /c ping 8.8.7.7 -n 2 & start C:\ProgramData\klga\klga.exe ROU5
        8⤵
        Suspicious use of WriteProcessMemory
        
        PID:500
        
        C:\Windows\system32\PING.EXE
        
        ping 8.8.7.7 -n 2
        9⤵
        Runs ping.exe
        
        PID:2888
        
        C:\ProgramData\klga\klga.exe
        
        C:\ProgramData\klga\klga.exe ROU5
        9⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of WriteProcessMemory
        
        PID:1588
        
        C:\Windows\SYSTEM32\cmd.exe
        
        cmd /c ping 8.8.7.7 -n 2 & start C:\ProgramData\klga\klga.exe PKFXLK
        10⤵
        Suspicious use of WriteProcessMemory
        
        PID:852
        
        C:\Windows\system32\PING.EXE
        
        ping 8.8.7.7 -n 2
        11⤵
        Runs ping.exe
        
        PID:3864
        
        C:\ProgramData\klga\klga.exe
        
        C:\ProgramData\klga\klga.exe PKFXLK
        11⤵
        Executes dropped EXE
        
        PID:4032

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/732-27-0x00007FF6E3830000-0x00007FF6E3886000-memory.dmp

Filesize
344KB

Download
memory/1588-33-0x00007FF6E3830000-0x00007FF6E3886000-memory.dmp

Filesize
344KB

Download
memory/1864-21-0x00007FF6E3830000-0x00007FF6E3886000-memory.dmp

Filesize
344KB

Download
memory/1864-22-0x0000000180000000-0x0000000180023000-memory.dmp

Filesize
140KB

Download
memory/3116-4-0x00007FF7FC7D0000-0x00007FF7FC7E0000-memory.dmp

Filesize
64KB

Download
memory/3116-5-0x00007FF7FC7D0000-0x00007FF7FC7E0000-memory.dmp

Filesize
64KB

Download
memory/3116-3-0x00007FF7FC7D0000-0x00007FF7FC7E0000-memory.dmp

Filesize
64KB

Download
memory/3116-6-0x00007FF81FB70000-0x00007FF8201A7000-memory.dmp

Filesize
6.2MB

Download
memory/3116-2-0x00007FF7FC7D0000-0x00007FF7FC7E0000-memory.dmp

Filesize
64KB

Download
memory/3896-14-0x0000000002B30000-0x0000000002B39000-memory.dmp

Filesize
36KB

Download
memory/3896-15-0x0000000010000000-0x0000000010007000-memory.dmp

Filesize
28KB

Download
memory/3896-16-0x0000000002BE0000-0x0000000002BE5000-memory.dmp

Filesize
20KB

Download
memory/3896-17-0x0000000002B20000-0x0000000002B26000-memory.dmp

Filesize
24KB

Download
memory/4032-39-0x00007FF6E3830000-0x00007FF6E3886000-memory.dmp

Filesize
344KB

Download