a39fde5dd2e3eeee0999bb6cc101861f34ee73d8974bf8e9b1814a10432879d6

General

Target

a39fde5dd2e3eeee0999bb6cc101861f34ee73d8974bf8e9b1814a10432879d6.dll
Size

188KB
MD5

a448d5da2fcddcd396f2b00af8e32c31
SHA1

6e52f689427e438bfa9240299903ffc6fc77baca
SHA256

a39fde5dd2e3eeee0999bb6cc101861f34ee73d8974bf8e9b1814a10432879d6
SHA512

8ee6f3aad08256a0e83772c357dc709e94756dbdf490680c9356a1b015fb867ea699f1189b372d67f5e1230b36422638816813d72df308d32f93f9f0d5c5f3a9
SSDEEP

3072:Cri0+utSCXQJdqByftkViecNemfh0N5Wlu/gX6ASMqsCAn+/B87CVKrNyGTbj:CyrJdqByftkVbgQen+p7obTbj

Score

9^/10

bootkit persistence spyware stealer

Malware Config

Signatures

Detects executables containing base64 encoded User Agent 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2184-1-0x0000000010000000-0x000000001006F000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/2184-3-0x0000000010000000-0x000000001006F000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Blocklisted process makes network request 9 IoCs

Processes:

rundll32.exe

flow	pid	process
22	2184	rundll32.exe
23	2184	rundll32.exe
44	2184	rundll32.exe
48	2184	rundll32.exe
47	2184	rundll32.exe
57	2184	rundll32.exe
62	2184	rundll32.exe
76	2184	rundll32.exe
82	2184	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

Processes:

rundll32.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Cache = "C:\\Windows\\SysWOW64\\rundll32.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\a39fde5dd2e3eeee0999bb6cc101861f34ee73d8974bf8e9b1814a10432879d6.dll\",Cache"	rundll32.exe

Enumerates connected drives 3 TTPs 2 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

Processes:

rundll32.exe

description ioc process

File opened (read-only) \??\a: 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

Processes:

rundll32.exe

description ioc process

File opened for modification \??\PHYSICALDRIVE0 rundll32.exe

description	ioc	process
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe

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

Processes:

rundll32.exe

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 4 IoCs

Processes:

rundll32.exe

pid process

2184 rundll32.exe
2184 rundll32.exe
2184 rundll32.exe
2184 rundll32.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

rundll32.exe

description pid process

Token: SeDebugPrivilege 2184 rundll32.exe

pid	process
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe

description	pid	process
Token: SeDebugPrivilege	2184	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

rundll32.exe

description	pid	process	target process
PID 1480 wrote to memory of 2184	1480	rundll32.exe	rundll32.exe
PID 1480 wrote to memory of 2184	1480	rundll32.exe	rundll32.exe
PID 1480 wrote to memory of 2184	1480	rundll32.exe	rundll32.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\a39fde5dd2e3eeee0999bb6cc101861f34ee73d8974bf8e9b1814a10432879d6.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1480

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\a39fde5dd2e3eeee0999bb6cc101861f34ee73d8974bf8e9b1814a10432879d6.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:2184

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1416 --field-trial-handle=3240,i,13319578961094268484,16557498665191861597,262144 --variations-seed-version /prefetch:8
1⤵
PID:2188

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Query Registry

2

T1012

Peripheral Device Discovery

1

T1120

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

memory/2184-0-0x0000000010000000-0x000000001006F000-memory.dmp

Filesize
444KB

Download
memory/2184-1-0x0000000010000000-0x000000001006F000-memory.dmp

Filesize
444KB

Download
memory/2184-3-0x0000000010000000-0x000000001006F000-memory.dmp

Filesize
444KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads