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
526s
max time network
547s
platform
windows11_x64
resource
win11
submitted
01-11-2021 12:31

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Report Analysis Logs

General

Target

fe028e6f99a02a016643a2db14534fa977a78f45b36ff9db5b60e7e709f5541c.dll
Size

172KB
MD5

a3d0c939bd3ecb8d11bd06c2bd15f45e
SHA1

b7fcdacc3507ed2f84752068fb0039c600003536
SHA256

fe028e6f99a02a016643a2db14534fa977a78f45b36ff9db5b60e7e709f5541c
SHA512

40a6bf12a8aedf563ae762249b8d5c44c39a1002ec581f07f1ff0f5b91dd6dfe6badadd71ae15efa608e129e5b3389390bf62d40dca9fddca2e04bd37e045f52

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
behavioral32/memory/1236-146-0x0000000001F00000-0x000000000202C000-memory.dmp	BazarLoaderVar6
behavioral32/memory/2172-150-0x000002842E8E0000-0x000002842EA0C000-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:

svchost.exeTiWorker.exe

description	ioc	process
File opened for modification	C:\Windows\SoftwareDistribution\DataStore\DataStore.jfm	svchost.exe
File opened for modification	C:\Windows\SoftwareDistribution\ReportingEvents.log	svchost.exe
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

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:

WaaSMedicAgent.exeWaaSMedicAgent.exeWaaSMedicAgent.exesvchost.exe

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

Suspicious use of AdjustPrivilegeToken 64 IoCs

Processes:

svchost.exesvchost.exeTiWorker.exe

description	pid	process
Token: SeShutdownPrivilege	728	svchost.exe
Token: SeCreatePagefilePrivilege	728	svchost.exe
Token: SeShutdownPrivilege	728	svchost.exe
Token: SeCreatePagefilePrivilege	728	svchost.exe
Token: SeShutdownPrivilege	728	svchost.exe
Token: SeCreatePagefilePrivilege	728	svchost.exe
Token: SeShutdownPrivilege	2496	svchost.exe
Token: SeCreatePagefilePrivilege	2496	svchost.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe
Token: SeSecurityPrivilege	4940	TiWorker.exe
Token: SeBackupPrivilege	4940	TiWorker.exe
Token: SeRestorePrivilege	4940	TiWorker.exe

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

svchost.exe

description	pid	process	target process
PID 2496 wrote to memory of 4824	2496	svchost.exe	MoUsoCoreWorker.exe
PID 2496 wrote to memory of 4824	2496	svchost.exe	MoUsoCoreWorker.exe

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\fe028e6f99a02a016643a2db14534fa977a78f45b36ff9db5b60e7e709f5541c.dll
1⤵
PID:1236

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe cfdc2207ee97892be2c32570f2672a60 qmO3CRr5906HmpPOkk+gxg.0.1.0.3.0
1⤵
- Modifies data under HKEY_USERS
PID:3396

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:728

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\fe028e6f99a02a016643a2db14534fa977a78f45b36ff9db5b60e7e709f5541c.dll,DllRegisterServer {54CC2BC3-E45C-4838-B6CF-9F4233DD7E14}
1⤵
PID:2172

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:2496

C:\Windows\uus\AMD64\MoUsoCoreWorker.exe
C:\Windows\uus\AMD64\MoUsoCoreWorker.exe
2⤵
PID:4824

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:4940

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe cfdc2207ee97892be2c32570f2672a60 qmO3CRr5906HmpPOkk+gxg.0.1.0.3.0
1⤵
- Modifies data under HKEY_USERS
PID:3196

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe cfdc2207ee97892be2c32570f2672a60 qmO3CRr5906HmpPOkk+gxg.0.1.0.3.0
1⤵
- Modifies data under HKEY_USERS
PID:3704

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/728-147-0x0000022F5AE20000-0x0000022F5AE30000-memory.dmp

Filesize
64KB

Download
memory/728-148-0x0000022F5B060000-0x0000022F5B070000-memory.dmp

Filesize
64KB

Download
memory/728-149-0x0000022F5D570000-0x0000022F5D574000-memory.dmp

Filesize
16KB

Download
memory/728-152-0x0000022F5DC20000-0x0000022F5DC24000-memory.dmp

Filesize
16KB

Download
memory/728-153-0x0000022F5DC10000-0x0000022F5DC11000-memory.dmp

Filesize
4KB

Download
memory/728-155-0x0000022F5E120000-0x0000022F5E121000-memory.dmp

Filesize
4KB

Download
memory/728-154-0x0000022F5E130000-0x0000022F5E134000-memory.dmp

Filesize
16KB

Download
memory/1236-146-0x0000000001F00000-0x000000000202C000-memory.dmp

Filesize
1.2MB

Download
memory/2172-150-0x000002842E8E0000-0x000002842EA0C000-memory.dmp

Filesize
1.2MB

Download
memory/4824-151-0x0000000000000000-mapping.dmp

Download