masslogger | 27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45

General

Target

27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe
Size

994KB
MD5

87b19be58879f1fc7052851a1a9192ff
SHA1

ec586f8577f60677e9fc2ca9fe53174169f19c60
SHA256

27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45
SHA512

1fcab9718ba6b2011e50a64ce59b03cb8a69cb523d4ad7dac56b1bc9e95740da38cab01311c0e591e341dfd8e87f040dbe00b21e95077c19172b770bde9b0cc7

Score

10^/10

masslogger collection persistence ransomware spyware stealer

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\79FE0CC911\Log.txt

Family

masslogger

Ransom Note

################################################################# MassLogger v1.3.3.0 ################################################################# ### Logger Details ### User Name: Admin IP: 154.61.71.51 Location: United States OS: Microsoft Windows 7 Ultimate 64bit CPU: Intel Core Processor (Broadwell) GPU: Standard VGA Graphics Adapter AV: NA Screen Resolution: 1280x720 Current Time: 5/24/2022 4:13:15 PM MassLogger Started: 5/24/2022 4:13:04 PM Interval: 2 hour MassLogger Process: C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe As Administrator: True

Extracted

Credentials

Protocol: smtp
Host:
smtp.privateemail.com
Port:
587
Username:
[email protected]
Password:
1234567890$$

Signatures

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

MassLogger log file 1 IoCs

Detects a log file produced by MassLogger.

yara_rule
masslogger_log_file

Checks computer location settings 2 TTPs 1 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-1-5-21-1819626980-2277161760-1023733287-1000\Control Panel\International\Geo\Nation	RegAsm.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
T1081

Accesses Microsoft Outlook profiles 1 TTPs 15 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key queried	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows\CurrentVersion\Run\ArzQT = "C:\\TBHNEBSE\\ArzQTu\\ArzQTujHU.vbs"	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe

Looks up external IP address via web service 1 IoCs

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

flow	ioc
4	api.ipify.org

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 852 set thread context of 1004	852	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe	27

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1004	RegAsm.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1004	RegAsm.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
852	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1004	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1004	RegAsm.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 852 wrote to memory of 1004	852	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe	27
PID 852 wrote to memory of 1004	852	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe	27
PID 852 wrote to memory of 1004	852	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe	27
PID 852 wrote to memory of 1004	852	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe	27
PID 852 wrote to memory of 1004	852	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe	27
PID 852 wrote to memory of 1004	852	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe	27
PID 852 wrote to memory of 1004	852	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe	27
PID 852 wrote to memory of 1004	852	27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe	27

outlook_office_path 1 IoCs

description	ioc	Process
Key queried	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key queried	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe
"C:\Users\Admin\AppData\Local\Temp\27938e39910afbdc569c8a629736b4c0bbfdf2573d01d12664bf05661074df45.exe"
1⤵
- Adds Run key to start application
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:852
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\\\\Microsoft.NET\\\\Framework\\\\v4.0.30319\\\\RegAsm.exe"
  2⤵
  - Checks computer location settings
  - Accesses Microsoft Outlook profiles
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - outlook_office_path
  - outlook_win_path
  PID:1004

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/852-54-0x00000000001E0000-0x00000000002DE000-memory.dmp

Filesize
1016KB

Download
memory/852-55-0x0000000004BA0000-0x0000000004C9A000-memory.dmp

Filesize
1000KB

Download
memory/852-56-0x0000000004390000-0x000000000444E000-memory.dmp

Filesize
760KB

Download
memory/852-58-0x0000000001FA0000-0x0000000001FA3000-memory.dmp

Filesize
12KB

Download
memory/1004-59-0x0000000076781000-0x0000000076783000-memory.dmp

Filesize
8KB

Download
memory/1004-60-0x0000000000400000-0x00000000004A6000-memory.dmp

Filesize
664KB

Download
memory/1004-61-0x0000000005220000-0x0000000005264000-memory.dmp

Filesize
272KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads