bazarloader | 092d57e94574cc3a9afa80daf5b3cb26160e4e4a55df6e48cbb4e314cfe6f509

Analysis

max time kernel
146s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-en-20220112
submitted
19/01/2022, 23:05

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General

Target
f1ee4d45ec92b5cdbd820781f9a65894.xll
Size 1.7MB
Sample220119-22wfdaeaa9
SHA256 092d57e94574cc3a9afa80daf5b3cb26160e4e4a55df6e48cbb4e314cfe6f509
MD5 f1ee4d45ec92b5cdbd820781f9a65894
SHA1 bfc80b287fb32251339bb94c2c66b2a7ec9f74db
SHA512 b46be98f565d3bb87c5e588f3027cfa4d834d91f167de16b67c065416eb2ebc266db7241b5394a365eb653264ff770b575627b8a05b4e4a58e630e88d0d4a8bb
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	2268	2676	rundll32.exe	53

Bazar/Team9 Loader payload 1 IoCs

resource	yara_rule
behavioral2/memory/2268-152-0x0000000180000000-0x000000018003C000-memory.dmp	BazarLoaderVar5

Blocklisted process makes network request 4 IoCs

flow	pid	Process
71	2268	rundll32.exe
73	2268	rundll32.exe
74	2268	rundll32.exe
75	2268	rundll32.exe

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
2676	EXCEL.EXE
2676	EXCEL.EXE
2268	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\CA\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs	WaaSMedicAgent.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\Disallowed\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\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\CA	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople	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\Microsoft\SystemCertificates\Disallowed\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople	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\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CTLs	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

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2676	EXCEL.EXE

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeSystemtimePrivilege	4052	svchost.exe
Token: SeSystemtimePrivilege	4052	svchost.exe
Token: SeIncBasePriorityPrivilege	4052	svchost.exe
Token: SeSystemtimePrivilege	4052	svchost.exe
Token: SeSystemtimePrivilege	2012	svchost.exe
Token: SeSystemtimePrivilege	2012	svchost.exe
Token: SeIncBasePriorityPrivilege	2012	svchost.exe

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
2676	EXCEL.EXE
2676	EXCEL.EXE
2676	EXCEL.EXE
2676	EXCEL.EXE
2676	EXCEL.EXE
2676	EXCEL.EXE
2676	EXCEL.EXE
2676	EXCEL.EXE

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 2676 wrote to memory of 2268	2676	EXCEL.EXE	62
PID 2676 wrote to memory of 2268	2676	EXCEL.EXE	62

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\f1ee4d45ec92b5cdbd820781f9a65894.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:2676
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 C:\Users\Admin\JavaObjectReflectL.dll , dopt
  2⤵
  - Process spawned unexpected child process
  - Blocklisted process makes network request
  - Loads dropped DLL
  PID:2268

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalServiceAndNoImpersonation -p
1⤵
PID:652

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe a1c61ab472f54a094a5dfb177c42ea6d zI7tg6i4XkS7qX4zTH8XcA.0.1.0.0.0
1⤵
- Modifies data under HKEY_USERS
PID:3248

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalService
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4052

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalService
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2012

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/2268-152-0x0000000180000000-0x000000018003C000-memory.dmp

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memory/2676-134-0x00007FFD4C370000-0x00007FFD4C380000-memory.dmp

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memory/2676-138-0x00007FFD4A0D0000-0x00007FFD4A0E0000-memory.dmp

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memory/2676-137-0x00007FFD4A0D0000-0x00007FFD4A0E0000-memory.dmp

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memory/2676-130-0x00007FFD4C370000-0x00007FFD4C380000-memory.dmp

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memory/2676-133-0x00007FFD4C370000-0x00007FFD4C380000-memory.dmp

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memory/2676-132-0x00007FFD4C370000-0x00007FFD4C380000-memory.dmp

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memory/2676-131-0x00007FFD4C370000-0x00007FFD4C380000-memory.dmp

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memory/2676-344-0x00007FFD4C370000-0x00007FFD4C380000-memory.dmp

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memory/2676-345-0x00007FFD4C370000-0x00007FFD4C380000-memory.dmp

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memory/2676-346-0x00007FFD4C370000-0x00007FFD4C380000-memory.dmp

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memory/2676-347-0x00007FFD4C370000-0x00007FFD4C380000-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