bazarloader | 9c4807666747c9befea4427e5b9791193fdb105d53400639e8cc401d92463be2

Resubmissions

01-11-2021 12:31

211101-pp5r3ahha4 10

31-10-2021 09:03

211031-k1bwxacfaq 10

14-10-2021 01:44

211014-b6aflafeg4 10

Analysis

max time kernel
545s
max time network
583s
platform
windows11_x64
resource
win11
submitted
01-11-2021 12:31

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General

Target

db5276c0d5ecd3b338a98983001a5b8cbbf5b488bf420d8cc0267801b963f479.dll
Size

172KB
MD5

6feafb5aa21e924e2a7dfc0cb87653e6
SHA1

eae7d011f43747b9a67b115733dc906dcbf976e7
SHA256

db5276c0d5ecd3b338a98983001a5b8cbbf5b488bf420d8cc0267801b963f479
SHA512

b21704bc4b06eed4d3468d144f90132af87af031dd9f6ad3ac771f75d9b02227eecbac79a53079955bbd9ea3a050d14a52af5829a50eaec745b7c617c16bc1a1

Score

10^/10

bazarloader dropper loader persistence

Malware Config

Signatures

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

Bazar/Team9 Loader payload 2 IoCs

Processes:

resource	yara_rule
behavioral30/memory/3520-146-0x0000000002EE0000-0x000000000300C000-memory.dmp	BazarLoaderVar6
behavioral30/memory/2076-150-0x000001D310B10000-0x000001D310C3C000-memory.dmp	BazarLoaderVar6

Sets service image path in registry 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1060

Modify Registry
T1112

Drops file in Windows directory 8 IoCs

Processes:

TiWorker.exesvchost.exe

description	ioc	process
File opened for modification	C:\Windows\Logs\CBS\CBS.log	TiWorker.exe
File opened for modification	C:\Windows\WinSxS\pending.xml	TiWorker.exe
File opened for modification	C:\Windows\WindowsUpdate.log	svchost.exe
File opened for modification	C:\Windows\SoftwareDistribution\DataStore\Logs\edb.chk	svchost.exe
File opened for modification	C:\Windows\SoftwareDistribution\DataStore\Logs\edb.log	svchost.exe
File opened for modification	C:\Windows\SoftwareDistribution\DataStore\DataStore.edb	svchost.exe
File opened for modification	C:\Windows\SoftwareDistribution\DataStore\DataStore.jfm	svchost.exe
File opened for modification	C:\Windows\SoftwareDistribution\ReportingEvents.log	svchost.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

svchost.exe

description	ioc	process
Key opened	\Registry\Machine\HARDWARE\DESCRIPTION\System\CentralProcessor\0	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	svchost.exe

Modifies data under HKEY_USERS 64 IoCs

Processes:

svchost.exeWaaSMedicAgent.exeWaaSMedicAgent.exeWaaSMedicAgent.exe

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

Suspicious use of AdjustPrivilegeToken 64 IoCs

Processes:

svchost.exesvchost.exeTiWorker.exe

description	pid	process
Token: SeShutdownPrivilege	1904	svchost.exe
Token: SeCreatePagefilePrivilege	1904	svchost.exe
Token: SeShutdownPrivilege	1904	svchost.exe
Token: SeCreatePagefilePrivilege	1904	svchost.exe
Token: SeShutdownPrivilege	1904	svchost.exe
Token: SeCreatePagefilePrivilege	1904	svchost.exe
Token: SeShutdownPrivilege	2316	svchost.exe
Token: SeCreatePagefilePrivilege	2316	svchost.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe
Token: SeSecurityPrivilege	2252	TiWorker.exe
Token: SeBackupPrivilege	2252	TiWorker.exe
Token: SeRestorePrivilege	2252	TiWorker.exe

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

svchost.exe

description	pid	process	target process
PID 2316 wrote to memory of 3564	2316	svchost.exe	MoUsoCoreWorker.exe
PID 2316 wrote to memory of 3564	2316	svchost.exe	MoUsoCoreWorker.exe

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\db5276c0d5ecd3b338a98983001a5b8cbbf5b488bf420d8cc0267801b963f479.dll
1⤵
PID:3520

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe e9d5e31d636c94f7059c34e1b25e2984 AsFTt+G8y0uofRGdgLP0iw.0.1.0.3.0
1⤵
- Modifies data under HKEY_USERS
PID:3392

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k netsvcs -p -s wuauserv
1⤵
- Drops file in Windows directory
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1904

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\db5276c0d5ecd3b338a98983001a5b8cbbf5b488bf420d8cc0267801b963f479.dll,DllRegisterServer {B151909A-20E8-43A7-9A5A-80F7D33A5B8E}
1⤵
PID:2076

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k netsvcs -p -s UsoSvc
1⤵
- Checks processor information in registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2316

C:\Windows\uus\AMD64\MoUsoCoreWorker.exe
C:\Windows\uus\AMD64\MoUsoCoreWorker.exe
2⤵
PID:3564

C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.22000.100_none_04da31ff4c67c24a\TiWorker.exe
C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.22000.100_none_04da31ff4c67c24a\TiWorker.exe -Embedding
1⤵
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:2252

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe e9d5e31d636c94f7059c34e1b25e2984 AsFTt+G8y0uofRGdgLP0iw.0.1.0.3.0
1⤵
- Modifies data under HKEY_USERS
PID:3152

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe e9d5e31d636c94f7059c34e1b25e2984 AsFTt+G8y0uofRGdgLP0iw.0.1.0.3.0
1⤵
- Modifies data under HKEY_USERS
PID:4964

Network

MITRE ATT&CK Matrix ATT&CK 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

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/1904-147-0x000001FC80B60000-0x000001FC80B70000-memory.dmp

Filesize
64KB

Download
memory/1904-148-0x000001FC81120000-0x000001FC81130000-memory.dmp

Filesize
64KB

Download
memory/1904-149-0x000001FC837F0000-0x000001FC837F4000-memory.dmp

Filesize
16KB

Download
memory/2076-150-0x000001D310B10000-0x000001D310C3C000-memory.dmp

Filesize
1.2MB

Download
memory/3520-146-0x0000000002EE0000-0x000000000300C000-memory.dmp

Filesize
1.2MB

Download
memory/3564-151-0x0000000000000000-mapping.dmp

Download