masslogger | ef0ad2f70a1fcffe2cd3e3c28adb13d7dfd0b7745405883524f27a13d46d4f24

General

Target

Documents.pdf.exe
Size

842KB
MD5

301e1a6b59a0e2249372ee47aec99f37
SHA1

614105ff4c3c6677a8c44f734a7ba282db17ad0c
SHA256

44a9da622295549820b1eb9645b524cc0a54b3c91832be3ba44630866a179607
SHA512

fd773441e5012d9d45d62537b47921fc4ba7ac0e9f5cff084e8e9ffa6994a551728aabeb24beae6b4094df8c00713f1580a642f31874fe4c3f6b3aa1923b0484

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: 5/21/2022 4:53:57 AM MassLogger Started: 5/21/2022 4:53:39 AM Interval: 2 hour MassLogger Process: C:\Users\Admin\AppData\Local\Temp\Documents.pdf.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/1956-62-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1956-63-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1956-65-0x00000000004A2C8E-mapping.dmp	family_masslogger
behavioral1/memory/1956-64-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1956-67-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1956-69-0x0000000000400000-0x00000000004A8000-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/1840-56-0x0000000006750000-0x00000000067FE000-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:

Documents.pdf.exe

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

Documents.pdf.exe

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

Documents.pdf.exe

description pid process target process

PID 1840 set thread context of 1956 1840 Documents.pdf.exe Documents.pdf.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

104 schtasks.exe
Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

Documents.pdf.exe

pid process

1956 Documents.pdf.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

Documents.pdf.exe

pid process

1956 Documents.pdf.exe
1956 Documents.pdf.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Documents.pdf.exe

description pid process

Token: SeDebugPrivilege 1956 Documents.pdf.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Documents.pdf.exe

pid process

1956 Documents.pdf.exe

flow	ioc
4	api.ipify.org

description	pid	process	target process
PID 1840 set thread context of 1956	1840	Documents.pdf.exe	Documents.pdf.exe

pid	process
104	schtasks.exe

pid	process
1956	Documents.pdf.exe

pid	process
1956	Documents.pdf.exe
1956	Documents.pdf.exe

description	pid	process
Token: SeDebugPrivilege	1956	Documents.pdf.exe

pid	process
1956	Documents.pdf.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

Documents.pdf.exe

description	pid	process	target process
PID 1840 wrote to memory of 104	1840	Documents.pdf.exe	schtasks.exe
PID 1840 wrote to memory of 104	1840	Documents.pdf.exe	schtasks.exe
PID 1840 wrote to memory of 104	1840	Documents.pdf.exe	schtasks.exe
PID 1840 wrote to memory of 104	1840	Documents.pdf.exe	schtasks.exe
PID 1840 wrote to memory of 1956	1840	Documents.pdf.exe	Documents.pdf.exe
PID 1840 wrote to memory of 1956	1840	Documents.pdf.exe	Documents.pdf.exe
PID 1840 wrote to memory of 1956	1840	Documents.pdf.exe	Documents.pdf.exe
PID 1840 wrote to memory of 1956	1840	Documents.pdf.exe	Documents.pdf.exe
PID 1840 wrote to memory of 1956	1840	Documents.pdf.exe	Documents.pdf.exe
PID 1840 wrote to memory of 1956	1840	Documents.pdf.exe	Documents.pdf.exe
PID 1840 wrote to memory of 1956	1840	Documents.pdf.exe	Documents.pdf.exe
PID 1840 wrote to memory of 1956	1840	Documents.pdf.exe	Documents.pdf.exe
PID 1840 wrote to memory of 1956	1840	Documents.pdf.exe	Documents.pdf.exe

outlook_office_path 1 IoCs

Processes:

Documents.pdf.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	Documents.pdf.exe

outlook_win_path 1 IoCs

Processes:

Documents.pdf.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	Documents.pdf.exe

C:\Users\Admin\AppData\Local\Temp\Documents.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Documents.pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1840

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\OmZtCG" /XML "C:\Users\Admin\AppData\Local\Temp\tmp4A0C.tmp"
2⤵
- Creates scheduled task(s)
PID:104

C:\Users\Admin\AppData\Local\Temp\Documents.pdf.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:1956

Network

MITRE ATT&CK Matrix ATT&CK 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

1

T1005

Email Collection

1

T1114

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp4A0C.tmp
Filesize
1KB

MD5
b51b7fd96d23527dce1d02c6648eda45

SHA1
d6fe76e5c35c740d14566558df78edd42c3e69a8

SHA256
daf685c9ce1acd6563a9c7d8390ffdc2d9509da01df74b34ecb2a6418d7292d7

SHA512
b428f6fd5c71e7dfa99c839ead71182e9d76bc8fb1a09b83a117c44c45b595ad4f32e3fb38a5c05483ebd910076d4066caaf53118949ac0fbef3f4ba6e91638b

Download Submit
memory/104-57-0x0000000000000000-mapping.dmp

Download
memory/1840-54-0x0000000001360000-0x0000000001438000-memory.dmp

Filesize
864KB

Download
memory/1840-55-0x0000000000380000-0x0000000000390000-memory.dmp

Filesize
64KB

Download
memory/1840-56-0x0000000006750000-0x00000000067FE000-memory.dmp

Filesize
696KB

Download
memory/1956-63-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1956-60-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1956-62-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1956-59-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1956-65-0x00000000004A2C8E-mapping.dmp

Download
memory/1956-64-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1956-67-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1956-69-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1956-70-0x00000000006C0000-0x0000000000704000-memory.dmp

Filesize
272KB

Download
memory/1956-71-0x00000000751C1000-0x00000000751C3000-memory.dmp

Filesize
8KB

Download
memory/1956-72-0x0000000004DC5000-0x0000000004DD6000-memory.dmp

Filesize
68KB

Download
memory/1956-73-0x0000000001340000-0x0000000001354000-memory.dmp

Filesize
80KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads