masslogger | 6e4fa34445f2439fe41ba7df0502aad79728646a2138b264e5945c9c980794ce

General

Target

PO__2001.exe
Size

1.2MB
MD5

5023566d205bcc7958ccbc84be950e9d
SHA1

4f7f6f3ad838506c5b141537f413eb341bf17027
SHA256

b88b1caee334cbd27f17d4310f2b51c26a5a9411452ad2f4b7fa17e1e81b59fb
SHA512

732c033c5c38464f2255e964054d1e4d727cd31f7c64817d9a29e3d44da30583c2e552646f7fbc4a37e4662a4457c2c40abd1ee95d80ddd84e62b20e004deaa6

Score

10^/10

masslogger agilenet collection ransomware spyware stealer

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\3B8E3C2477\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 6:12:28 AM MassLogger Started: 5/21/2022 6:12:09 AM Interval: 2 hour MassLogger Process: C:\Users\Admin\AppData\Local\Temp\RegAsm.exe MassLogger Melt: true 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 7 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1192-54-0x0000000000FC0000-0x0000000001102000-memory.dmp	family_masslogger
behavioral1/memory/1264-63-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1264-64-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1264-65-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1264-66-0x00000000004A31AE-mapping.dmp	family_masslogger
behavioral1/memory/1264-69-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger
behavioral1/memory/1264-71-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger

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

Processes:

yara_rule

masslogger_log_file
Executes dropped EXE 1 IoCs

Processes:

RegAsm.exe

pid process

1264 RegAsm.exe
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:

RegAsm.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Control Panel\International\Geo\Nation RegAsm.exe
Loads dropped DLL 2 IoCs

Processes:

PO__2001.exeRegAsm.exe

pid process

1192 PO__2001.exe
1264 RegAsm.exe

yara_rule
masslogger_log_file

pid	process
1264	RegAsm.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Control Panel\International\Geo\Nation	RegAsm.exe

pid	process
1192	PO__2001.exe
1264	RegAsm.exe

Obfuscated with Agile.Net obfuscator 1 IoCs

Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

agilenet

Processes:

resource	yara_rule
behavioral1/memory/1192-55-0x00000000008E0000-0x00000000008F4000-memory.dmp	agile_net

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:

RegAsm.exe

description	ioc	process
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook	RegAsm.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:

PO__2001.exe

description pid process target process

PID 1192 set thread context of 1264 1192 PO__2001.exe RegAsm.exe
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

PO__2001.exeRegAsm.exepowershell.exe

pid process

1192 PO__2001.exe
1192 PO__2001.exe
1192 PO__2001.exe
1264 RegAsm.exe
1440 powershell.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

PO__2001.exeRegAsm.exepowershell.exe

description pid process

Token: SeDebugPrivilege 1192 PO__2001.exe
Token: SeDebugPrivilege 1264 RegAsm.exe
Token: SeDebugPrivilege 1440 powershell.exe

flow	ioc
4	api.ipify.org

description	pid	process	target process
PID 1192 set thread context of 1264	1192	PO__2001.exe	RegAsm.exe

pid	process
1192	PO__2001.exe
1192	PO__2001.exe
1192	PO__2001.exe
1264	RegAsm.exe
1440	powershell.exe

description	pid	process
Token: SeDebugPrivilege	1192	PO__2001.exe
Token: SeDebugPrivilege	1264	RegAsm.exe
Token: SeDebugPrivilege	1440	powershell.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

PO__2001.exeRegAsm.execmd.exe

description	pid	process	target process
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1192 wrote to memory of 1264	1192	PO__2001.exe	RegAsm.exe
PID 1264 wrote to memory of 1064	1264	RegAsm.exe	cmd.exe
PID 1264 wrote to memory of 1064	1264	RegAsm.exe	cmd.exe
PID 1264 wrote to memory of 1064	1264	RegAsm.exe	cmd.exe
PID 1264 wrote to memory of 1064	1264	RegAsm.exe	cmd.exe
PID 1064 wrote to memory of 1440	1064	cmd.exe	powershell.exe
PID 1064 wrote to memory of 1440	1064	cmd.exe	powershell.exe
PID 1064 wrote to memory of 1440	1064	cmd.exe	powershell.exe
PID 1064 wrote to memory of 1440	1064	cmd.exe	powershell.exe

outlook_office_path 1 IoCs

Processes:

RegAsm.exe

description	ioc	process
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

outlook_win_path 1 IoCs

Processes:

RegAsm.exe

description	ioc	process
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\PO__2001.exe
"C:\Users\Admin\AppData\Local\Temp\PO__2001.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1192
- C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\RegAsm.exe"
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Loads dropped DLL
  - Accesses Microsoft Outlook profiles
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  - outlook_office_path
  - outlook_win_path
  PID:1264
- - C:\Windows\SysWOW64\cmd.exe
    "cmd" /c start /b powershell Start-Sleep -Seconds 2; Remove-Item -path 'C:\Users\Admin\AppData\Local\Temp\RegAsm.exe' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1064
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell Start-Sleep -Seconds 2; Remove-Item -path 'C:\Users\Admin\AppData\Local\Temp\RegAsm.exe'
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1440

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

1

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\RegAsm.exe

Filesize
63KB

MD5
b58b926c3574d28d5b7fdd2ca3ec30d5

SHA1
d260c4ffd603a9cfc057fcb83d678b1cecdf86f9

SHA256
6e70b56d748c4ccab13cc8a055d3795ea0dd95fe3b70568d7d3ac0c6621140a3

SHA512
b13cb998822b716b695013bcd6dec62a2290567d0d1743b2d982ca084235cf69c6ea1fc91c9d4e62657c6f9e102c7c60e81296ab055ffe43b887c5f8ec8958ab

Download Submit
C:\Users\Admin\AppData\Local\Temp\RegAsm.exe

Filesize
63KB

MD5
b58b926c3574d28d5b7fdd2ca3ec30d5

SHA1
d260c4ffd603a9cfc057fcb83d678b1cecdf86f9

SHA256
6e70b56d748c4ccab13cc8a055d3795ea0dd95fe3b70568d7d3ac0c6621140a3

SHA512
b13cb998822b716b695013bcd6dec62a2290567d0d1743b2d982ca084235cf69c6ea1fc91c9d4e62657c6f9e102c7c60e81296ab055ffe43b887c5f8ec8958ab

Download Submit
\Users\Admin\AppData\Local\Temp\RegAsm.exe

Filesize
63KB

MD5
b58b926c3574d28d5b7fdd2ca3ec30d5

SHA1
d260c4ffd603a9cfc057fcb83d678b1cecdf86f9

SHA256
6e70b56d748c4ccab13cc8a055d3795ea0dd95fe3b70568d7d3ac0c6621140a3

SHA512
b13cb998822b716b695013bcd6dec62a2290567d0d1743b2d982ca084235cf69c6ea1fc91c9d4e62657c6f9e102c7c60e81296ab055ffe43b887c5f8ec8958ab

Download Submit
\Users\Admin\AppData\Local\Temp\RegAsm.exe

Filesize
63KB

MD5
b58b926c3574d28d5b7fdd2ca3ec30d5

SHA1
d260c4ffd603a9cfc057fcb83d678b1cecdf86f9

SHA256
6e70b56d748c4ccab13cc8a055d3795ea0dd95fe3b70568d7d3ac0c6621140a3

SHA512
b13cb998822b716b695013bcd6dec62a2290567d0d1743b2d982ca084235cf69c6ea1fc91c9d4e62657c6f9e102c7c60e81296ab055ffe43b887c5f8ec8958ab

Download Submit
memory/1064-77-0x0000000000000000-mapping.dmp

Download
memory/1192-56-0x0000000000930000-0x0000000000938000-memory.dmp

Filesize
32KB

Download
memory/1192-58-0x0000000000960000-0x0000000000968000-memory.dmp

Filesize
32KB

Download
memory/1192-54-0x0000000000FC0000-0x0000000001102000-memory.dmp

Filesize
1.3MB

Download
memory/1192-55-0x00000000008E0000-0x00000000008F4000-memory.dmp

Filesize
80KB

Download
memory/1192-57-0x0000000000950000-0x0000000000958000-memory.dmp

Filesize
32KB

Download
memory/1264-69-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1264-66-0x00000000004A31AE-mapping.dmp

Download
memory/1264-65-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1264-64-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1264-71-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1264-63-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1264-73-0x00000000765C1000-0x00000000765C3000-memory.dmp

Filesize
8KB

Download
memory/1264-61-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1264-75-0x0000000000590000-0x00000000005D4000-memory.dmp

Filesize
272KB

Download
memory/1264-76-0x0000000004F15000-0x0000000004F26000-memory.dmp

Filesize
68KB

Download
memory/1264-60-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download
memory/1440-78-0x0000000000000000-mapping.dmp

Download
memory/1440-80-0x0000000074410000-0x00000000749BB000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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