masslogger | 94346921a393491186c134bd6a55b98c98b95d69e6d0066bbb4385899ff7599c

General

Target

k1f0Acf29eG3FzJ.exe
Size

908KB
MD5

4638aa710733a365c1265303da13c0b3
SHA1

31a9b61bd7301b93eef5fb117ae16dfe3f00bed3
SHA256

5caa7e9eb486ca9161d410e9fe1dc4074c3b0c66f8d6cd05ab5ae6dd35837c5a
SHA512

bfb9b61cc9c28e35307bafbf63e19379fcb307b02652decd4d08f89e8dc28cc56b1a50f95648760ea26167a51b57bc79ed40bc57432cf4d7cdc0bd174993bee3

Score

10^/10

masslogger collection ransomware rezer0 spyware stealer

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\AEF946DCB4\Log.txt

Family

masslogger

Ransom Note

################################################################# MassLogger v1.3.7.0 ################################################################# ### Logger Details ### User Name: Admin IP: 154.61.71.50 Location: United States Windows OS: Microsoft Windows 7 Ultimate 64bit Windows Serial Key: D4F6K-QK3RD-TMVMJ-BBMRX-3MBMV CPU: Intel Core Processor (Broadwell) GPU: Standard VGA Graphics Adapter AV: NA Screen Resolution: 1280x720 Current Time: 5/20/2022 3:07:14 PM MassLogger Started: 5/20/2022 3:06:50 PM Interval: 2 hour MassLogger Process: C:\Users\Admin\AppData\Local\Temp\k1f0Acf29eG3FzJ.exe MassLogger Melt: false MassLogger Exit after delivery: false As Administrator: True Processes:

Signatures

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

MassLogger Main Payload 6 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1508-62-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1508-63-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1508-64-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1508-65-0x00000000004A2F2E-mapping.dmp	family_masslogger
behavioral1/memory/1508-67-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1508-69-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger

MassLogger log file 1 IoCs
Detects a log file produced by MassLogger.

Processes:

yara_rule

masslogger_log_file

yara_rule
masslogger_log_file

ReZer0 packer 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

Processes:

resource	yara_rule
behavioral1/memory/956-56-0x0000000007D00000-0x0000000007DAE000-memory.dmp	rezer0

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

Processes:

k1f0Acf29eG3FzJ.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Control Panel\International\Geo\Nation	k1f0Acf29eG3FzJ.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

Processes:

k1f0Acf29eG3FzJ.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook	k1f0Acf29eG3FzJ.exe
Key queried	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook	k1f0Acf29eG3FzJ.exe
Key created	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.exe
Key created	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	k1f0Acf29eG3FzJ.exe
Key queried	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	k1f0Acf29eG3FzJ.exe
Key queried	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.exe
Key created	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook	k1f0Acf29eG3FzJ.exe
Key opened	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.exe
Key created	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.exe
Key queried	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook	k1f0Acf29eG3FzJ.exe
Key opened	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.exe
Key created	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.exe
Key opened	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.exe
Key queried	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.exe
Key queried	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.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.

Processes:

flow ioc

4 api.ipify.org
Suspicious use of SetThreadContext 1 IoCs

Processes:

k1f0Acf29eG3FzJ.exe

description pid process target process

PID 956 set thread context of 1508 956 k1f0Acf29eG3FzJ.exe k1f0Acf29eG3FzJ.exe
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

Processes:

schtasks.exe

pid process

1980 schtasks.exe
Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

k1f0Acf29eG3FzJ.exe

pid process

1508 k1f0Acf29eG3FzJ.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

k1f0Acf29eG3FzJ.exek1f0Acf29eG3FzJ.exe

pid process

956 k1f0Acf29eG3FzJ.exe
956 k1f0Acf29eG3FzJ.exe
1508 k1f0Acf29eG3FzJ.exe
1508 k1f0Acf29eG3FzJ.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

k1f0Acf29eG3FzJ.exek1f0Acf29eG3FzJ.exe

description pid process

Token: SeDebugPrivilege 956 k1f0Acf29eG3FzJ.exe
Token: SeDebugPrivilege 1508 k1f0Acf29eG3FzJ.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

k1f0Acf29eG3FzJ.exe

pid process

1508 k1f0Acf29eG3FzJ.exe

flow	ioc
4	api.ipify.org

description	pid	process	target process
PID 956 set thread context of 1508	956	k1f0Acf29eG3FzJ.exe	k1f0Acf29eG3FzJ.exe

pid	process
1980	schtasks.exe

pid	process
1508	k1f0Acf29eG3FzJ.exe

pid	process
956	k1f0Acf29eG3FzJ.exe
956	k1f0Acf29eG3FzJ.exe
1508	k1f0Acf29eG3FzJ.exe
1508	k1f0Acf29eG3FzJ.exe

description	pid	process
Token: SeDebugPrivilege	956	k1f0Acf29eG3FzJ.exe
Token: SeDebugPrivilege	1508	k1f0Acf29eG3FzJ.exe

pid	process
1508	k1f0Acf29eG3FzJ.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

k1f0Acf29eG3FzJ.exe

description	pid	process	target process
PID 956 wrote to memory of 1980	956	k1f0Acf29eG3FzJ.exe	schtasks.exe
PID 956 wrote to memory of 1980	956	k1f0Acf29eG3FzJ.exe	schtasks.exe
PID 956 wrote to memory of 1980	956	k1f0Acf29eG3FzJ.exe	schtasks.exe
PID 956 wrote to memory of 1980	956	k1f0Acf29eG3FzJ.exe	schtasks.exe
PID 956 wrote to memory of 1508	956	k1f0Acf29eG3FzJ.exe	k1f0Acf29eG3FzJ.exe
PID 956 wrote to memory of 1508	956	k1f0Acf29eG3FzJ.exe	k1f0Acf29eG3FzJ.exe
PID 956 wrote to memory of 1508	956	k1f0Acf29eG3FzJ.exe	k1f0Acf29eG3FzJ.exe
PID 956 wrote to memory of 1508	956	k1f0Acf29eG3FzJ.exe	k1f0Acf29eG3FzJ.exe
PID 956 wrote to memory of 1508	956	k1f0Acf29eG3FzJ.exe	k1f0Acf29eG3FzJ.exe
PID 956 wrote to memory of 1508	956	k1f0Acf29eG3FzJ.exe	k1f0Acf29eG3FzJ.exe
PID 956 wrote to memory of 1508	956	k1f0Acf29eG3FzJ.exe	k1f0Acf29eG3FzJ.exe
PID 956 wrote to memory of 1508	956	k1f0Acf29eG3FzJ.exe	k1f0Acf29eG3FzJ.exe
PID 956 wrote to memory of 1508	956	k1f0Acf29eG3FzJ.exe	k1f0Acf29eG3FzJ.exe

outlook_office_path 1 IoCs

Processes:

k1f0Acf29eG3FzJ.exe

description	ioc	process
Key queried	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.exe

outlook_win_path 1 IoCs

Processes:

k1f0Acf29eG3FzJ.exe

description	ioc	process
Key queried	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	k1f0Acf29eG3FzJ.exe

C:\Users\Admin\AppData\Local\Temp\k1f0Acf29eG3FzJ.exe
"C:\Users\Admin\AppData\Local\Temp\k1f0Acf29eG3FzJ.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:956

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\fnYKykWpGW" /XML "C:\Users\Admin\AppData\Local\Temp\tmp2A2D.tmp"
2⤵
- Creates scheduled task(s)
PID:1980

C:\Users\Admin\AppData\Local\Temp\k1f0Acf29eG3FzJ.exe
"{path}"
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:1508

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp2A2D.tmp

Filesize
1KB

MD5
f7a8be487e9eb7c2448f5651083a20bc

SHA1
a518158faee4d6900d6dc13db42b3e6cdb667d04

SHA256
163a72e8825ddb9adde0ff9629dd685026c8c6bdeead22166db4e883c165eeed

SHA512
0f3ecaa259252ca85692ae094493090cb147b9f4fb5b62cc3df47a6c312abcc379e536bce4b4c8ed6dd833bb3cf899b93d604021f3df0ceb523286fc540336ed

Download Submit
memory/956-55-0x0000000000330000-0x0000000000344000-memory.dmp

Filesize
80KB

Download
memory/956-56-0x0000000007D00000-0x0000000007DAE000-memory.dmp

Filesize
696KB

Download
memory/956-54-0x0000000000CF0000-0x0000000000DDA000-memory.dmp

Filesize
936KB

Download
memory/1508-63-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1508-59-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1508-60-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1508-62-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1508-64-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1508-65-0x00000000004A2F2E-mapping.dmp

Download
memory/1508-67-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1508-69-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1508-70-0x00000000004B0000-0x00000000004F4000-memory.dmp

Filesize
272KB

Download
memory/1508-71-0x00000000764C1000-0x00000000764C3000-memory.dmp

Filesize
8KB

Download
memory/1508-72-0x00000000043D5000-0x00000000043E6000-memory.dmp

Filesize
68KB

Download
memory/1980-57-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads