bazarloader | a9f6712e7cf49bddcbdef715d13768157f94252be28bd74331a9ff963401137c

Analysis

max time kernel
118s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-en-20220112
submitted
19/01/2022, 22:46

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General

Target
44b44fbf4c7fbd56e8cf7411054aa0d6.xll
Size 1.7MB
Sample220119-2pzbhadhc7
SHA256 a9f6712e7cf49bddcbdef715d13768157f94252be28bd74331a9ff963401137c
MD5 44b44fbf4c7fbd56e8cf7411054aa0d6
SHA1 5e7822e039183a026e10ee02ce50033148b8bbdd
SHA512 7820502414958f5fd8720ddc6e414af06c9ff5340876e913a96e563a16d5ffd02013fb784cdfa2a97c70d84fdb32e03dde5421277db2ea87b010bc5b36d673ca
MD5 SHA1 SHA512

Score

10^/10

bazarloader dropper loader persistence

Malware Config

Extracted

Language

xlm4.0

Source

Signatures

Bazar Loader
Detected loader normally used to deploy BazarBackdoor malware.
loader dropper bazarloader

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	544	2868	rundll32.exe	51

Bazar/Team9 Loader payload 1 IoCs

resource	yara_rule
behavioral2/memory/544-152-0x0000000180000000-0x000000018003C000-memory.dmp	BazarLoaderVar5

Sets service image path in registry 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1060

Modify Registry
T1112

Loads dropped DLL 3 IoCs

pid	Process
2868	EXCEL.EXE
2868	EXCEL.EXE
544	rundll32.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

Modifies data under HKEY_USERS 41 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA	WaaSMedicAgent.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2868	EXCEL.EXE

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeSystemtimePrivilege	688	svchost.exe
Token: SeSystemtimePrivilege	688	svchost.exe
Token: SeIncBasePriorityPrivilege	688	svchost.exe
Token: SeSystemtimePrivilege	688	svchost.exe
Token: SeSystemtimePrivilege	3240	svchost.exe
Token: SeSystemtimePrivilege	3240	svchost.exe
Token: SeIncBasePriorityPrivilege	3240	svchost.exe

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
2868	EXCEL.EXE
2868	EXCEL.EXE
2868	EXCEL.EXE
2868	EXCEL.EXE
2868	EXCEL.EXE
2868	EXCEL.EXE
2868	EXCEL.EXE
2868	EXCEL.EXE

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 2868 wrote to memory of 544	2868	EXCEL.EXE	58
PID 2868 wrote to memory of 544	2868	EXCEL.EXE	58

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\44b44fbf4c7fbd56e8cf7411054aa0d6.xll"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2868
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 C:\Users\Admin\JavaObjectReflectiveF.dll , dopt
  2⤵
  - Process spawned unexpected child process
  - Loads dropped DLL
  PID:544

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalServiceAndNoImpersonation -p
1⤵
PID:2112

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe c8c184b03ec7f2a36ca2b88ef518e17e u3pCchQsYkujnCz7FYwSeA.0.1.0.0.0
1⤵
- Modifies data under HKEY_USERS
PID:3664

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalService
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:688

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalService
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3240

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k wusvcs -p
1⤵
PID:2924

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/544-152-0x0000000180000000-0x000000018003C000-memory.dmp

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memory/2868-134-0x00007FFB39C70000-0x00007FFB39C80000-memory.dmp

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memory/2868-138-0x00007FFB374C0000-0x00007FFB374D0000-memory.dmp

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memory/2868-137-0x00007FFB374C0000-0x00007FFB374D0000-memory.dmp

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memory/2868-130-0x00007FFB39C70000-0x00007FFB39C80000-memory.dmp

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memory/2868-133-0x00007FFB39C70000-0x00007FFB39C80000-memory.dmp

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memory/2868-132-0x00007FFB39C70000-0x00007FFB39C80000-memory.dmp

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memory/2868-131-0x00007FFB39C70000-0x00007FFB39C80000-memory.dmp

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memory/2868-174-0x00007FFB39C70000-0x00007FFB39C80000-memory.dmp

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memory/2868-175-0x00007FFB39C70000-0x00007FFB39C80000-memory.dmp

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memory/2868-176-0x00007FFB39C70000-0x00007FFB39C80000-memory.dmp

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memory/2868-177-0x00007FFB39C70000-0x00007FFB39C80000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads