masslogger | 3c281c72cc38c73345d2ad592d840abd5264816543659e4f69517da8c0a453d8

Analysis

max time kernel
69s
max time network
104s
platform
windows10_x64
resource
win10v20201028
submitted
04/03/2021, 18:20

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General

Target
cec2799b_extracted.exe
Size 641KB
Sample210304-wkm7br5em2
SHA256 3c281c72cc38c73345d2ad592d840abd5264816543659e4f69517da8c0a453d8
MD5 52a0832b694f1c58d2ecadaf6d4afe90
SHA1 27cb1d4571f36fce5c936386edcdc10d72126867
SHA512 ac5a4a2218316f3117cf1752e24f602d1a19bc1c3003c7233a3549b0e6d027de93f1e518e386ca53fbac6eb57f7d1252e1b884ca1c33d3fedd686beb23fed7bc
MD5 SHA1 SHA512

Score

10^/10

masslogger ransomware spyware stealer

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\109933CE9F\Log.txt

masslogger

Ransom Note

################################################################# MassLogger v1.3.2.0 ################################################################# ### Logger Details ### User Name: Admin IP: 154.61.71.51 Location: United States OS: Microsoft Windows 10 Enterprise64bit CPU: Persocon Processor 2.5+ GPU: Microsoft Basic Display Adapter AV: NA Screen Resolution: 1280x720 Current Time: 3/4/2021 6:54:30 PM MassLogger Started: 3/4/2021 6:54:26 PM Interval: 6 hour MassLogger Process: C:\Users\Admin\AppData\Local\Temp\cec2799b_extracted.exe As Administrator: True

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\109933CE9F\Log.txt

masslogger

Ransom Note

################################################################# MassLogger v1.3.2.0 ################################################################# ### Logger Details ### User Name: Admin IP: 154.61.71.51 Location: United States OS: Microsoft Windows 10 Enterprise64bit CPU: Persocon Processor 2.5+ GPU: Microsoft Basic Display Adapter AV: NA Screen Resolution: 1280x720 Current Time: 3/4/2021 6:54:56 PM MassLogger Started: 3/4/2021 6:54:53 PM Interval: 6 hour MassLogger Process: C:\Users\Admin\AppData\Roaming\VideoLAN\vlc.exe As Administrator: True

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\109933CE9F\Log.txt

masslogger

Ransom Note

################################################################# MassLogger v1.3.2.0 ################################################################# ### Logger Details ### User Name: Admin IP: 154.61.71.51 Location: United States OS: Microsoft Windows 10 Enterprise64bit CPU: Persocon Processor 2.5+ GPU: Microsoft Basic Display Adapter AV: NA Screen Resolution: 1280x720 Current Time: 3/4/2021 6:54:30 PM MassLogger Started: 3/4/2021 6:54:26 PM Interval: 6 hour MassLogger Process: C:\Users\Admin\AppData\Local\Temp\cec2799b_extracted.exe As Administrator: True ### WD Exclusion ### Disabled

Signatures

MassLogger
Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.
stealer spyware masslogger

MassLogger log file 3 IoCs

Detects a log file produced by MassLogger.

resource	yara_rule
	masslogger_log_file
	masslogger_log_file
behavioral2/files/0x000300000001a2df-23.dat	masslogger_log_file

Executes dropped EXE 1 IoCs

pid	Process
1416	vlc.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Control Panel\International\Geo\Nation	cec2799b_extracted.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Control Panel\International\Geo\Nation	vlc.exe

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

Data from Local System
T1005

Credentials in Files
T1081

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
16	api.ipify.org
18	api.ipify.org

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1276	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1168	timeout.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1416	vlc.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
4768	cec2799b_extracted.exe
1416	vlc.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4768	cec2799b_extracted.exe
Token: SeDebugPrivilege	1416	vlc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1416	vlc.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4768 wrote to memory of 816	4768	cec2799b_extracted.exe	78
PID 4768 wrote to memory of 816	4768	cec2799b_extracted.exe	78
PID 4768 wrote to memory of 816	4768	cec2799b_extracted.exe	78
PID 4768 wrote to memory of 912	4768	cec2799b_extracted.exe	79
PID 4768 wrote to memory of 912	4768	cec2799b_extracted.exe	79
PID 4768 wrote to memory of 912	4768	cec2799b_extracted.exe	79
PID 912 wrote to memory of 1168	912	cmd.exe	82
PID 912 wrote to memory of 1168	912	cmd.exe	82
PID 912 wrote to memory of 1168	912	cmd.exe	82
PID 816 wrote to memory of 1276	816	cmd.exe	83
PID 816 wrote to memory of 1276	816	cmd.exe	83
PID 816 wrote to memory of 1276	816	cmd.exe	83
PID 912 wrote to memory of 1416	912	cmd.exe	84
PID 912 wrote to memory of 1416	912	cmd.exe	84
PID 912 wrote to memory of 1416	912	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\cec2799b_extracted.exe
"C:\Users\Admin\AppData\Local\Temp\cec2799b_extracted.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4768
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn vlc.exe /tr '"C:\Users\Admin\AppData\Roaming\VideoLAN\vlc.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:816
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn vlc.exe /tr '"C:\Users\Admin\AppData\Roaming\VideoLAN\vlc.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:1276
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB4CF.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:912
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1168
- - C:\Users\Admin\AppData\Roaming\VideoLAN\vlc.exe
    "C:\Users\Admin\AppData\Roaming\VideoLAN\vlc.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: AddClipboardFormatListener
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:1416

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/1416-18-0x00000000732C0000-0x00000000739AE000-memory.dmp

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memory/1416-22-0x0000000002C20000-0x0000000002C21000-memory.dmp

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memory/1416-30-0x0000000008260000-0x0000000008261000-memory.dmp

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memory/1416-29-0x0000000008170000-0x0000000008171000-memory.dmp

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memory/1416-28-0x0000000007840000-0x000000000787E000-memory.dmp

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memory/1416-27-0x00000000067F0000-0x00000000067F1000-memory.dmp

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memory/1416-21-0x00000000055F0000-0x00000000055F1000-memory.dmp

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memory/4768-2-0x00000000732D0000-0x00000000739BE000-memory.dmp

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memory/4768-9-0x0000000006010000-0x0000000006011000-memory.dmp

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memory/4768-3-0x00000000007A0000-0x00000000007A1000-memory.dmp

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memory/4768-5-0x0000000005270000-0x0000000005271000-memory.dmp

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memory/4768-6-0x0000000001170000-0x0000000001171000-memory.dmp

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memory/4768-7-0x0000000005190000-0x0000000005191000-memory.dmp

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memory/4768-8-0x0000000005780000-0x0000000005781000-memory.dmp

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