b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6

General

Target

b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6.dll
Size

89KB
MD5

c944bb0548937bcaeb27b59efd866912
SHA1

59fb5f7d37690f950edf70ce7dd8abb1d634d3d3
SHA256

b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6
SHA512

2b644352fd9209f0f4f1976b2ec57cb058c98667dc385c2d0edb630d3a210df6122f207b735bc136ebc5b822ca5308a9c5c7019daf0e9381f6bf3d9f373c2a4e
SSDEEP

1536:XHXqO6ZG03eyenOj9lgA/PObuTMT5NMCfL7ojaZf5aZlBlG7:M1uF6Feu2NlQOBcG7

Score

9^/10

Malware Config

Signatures

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral1/memory/1524-2-0x0000000010000000-0x0000000010033000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1524-6-0x0000000010000000-0x0000000010033000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1524-7-0x0000000010000000-0x0000000010033000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral1/memory/1524-1-0x0000000010000000-0x0000000010033000-memory.dmp	UPX
behavioral1/memory/1524-2-0x0000000010000000-0x0000000010033000-memory.dmp	UPX
behavioral1/memory/1524-6-0x0000000010000000-0x0000000010033000-memory.dmp	UPX
behavioral1/memory/1524-7-0x0000000010000000-0x0000000010033000-memory.dmp	UPX

Blocklisted process makes network request 10 IoCs

flow	pid	Process
3	1524	rundll32.exe
7	1524	rundll32.exe
8	1524	rundll32.exe
9	1524	rundll32.exe
10	1524	rundll32.exe
13	1524	rundll32.exe
14	1524	rundll32.exe
15	1524	rundll32.exe
17	1524	rundll32.exe
18	1524	rundll32.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2737914667-933161113-3798636211-1000\Software\Microsoft\Windows\CurrentVersion\Run\VIEW = "C:\\Windows\\SysWOW64\\rundll32.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6.dll\",Viewer"	rundll32.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	rundll32.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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1524	rundll32.exe
1524	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1524	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2116 wrote to memory of 1524	2116	rundll32.exe	28
PID 2116 wrote to memory of 1524	2116	rundll32.exe	28
PID 2116 wrote to memory of 1524	2116	rundll32.exe	28
PID 2116 wrote to memory of 1524	2116	rundll32.exe	28
PID 2116 wrote to memory of 1524	2116	rundll32.exe	28
PID 2116 wrote to memory of 1524	2116	rundll32.exe	28
PID 2116 wrote to memory of 1524	2116	rundll32.exe	28

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2116
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\b5f8892249e83bf069f1253c2af3219e4471025855f315472ab9b787c9abd5c6.dll,#1
  2⤵
  - Blocklisted process makes network request
  - Adds Run key to start application
  - Enumerates connected drives
  - Writes to the Master Boot Record (MBR)
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1524

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/1524-1-0x0000000010000000-0x0000000010033000-memory.dmp

Filesize
204KB

Download
memory/1524-0-0x0000000010000000-0x0000000010033000-memory.dmp

Filesize
204KB

Download
memory/1524-2-0x0000000010000000-0x0000000010033000-memory.dmp

Filesize
204KB

Download
memory/1524-6-0x0000000010000000-0x0000000010033000-memory.dmp

Filesize
204KB

Download
memory/1524-7-0x0000000010000000-0x0000000010033000-memory.dmp

Filesize
204KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads