masslogger | e9575adae2fa6afb6b8d8fb098feec9d4acbadabda4beeca90433b578cd6afa1

Analysis

max time kernel
45s
max time network
46s
platform
windows7_x64
resource
win7v20201028
submitted
15/12/2020, 12:19

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General

Target
TIRNAK.exe
Size 29KB
Sample201215-9k9yn8545x
SHA256 e9575adae2fa6afb6b8d8fb098feec9d4acbadabda4beeca90433b578cd6afa1
MD5 2cb0cf48d5eafbd16bbf8cdda749d628
SHA1 1b71449f295eae0994f4d62de838b1af168c0a09
SHA512 1f6e0be8e3c66aa8a1ac7e41b26b0b29bf055039c3bd8116cb33aa5874077c1325fcbfc0a934e2fdd6da89acea34b1cf2875147f0470346afeca7e9193d79927
MD5 SHA1 SHA512

Score

10^/10

masslogger persistence spyware stealer

Malware Config

Extracted

Credentials

Protocol
smtp
Host
mail.porathacorp.com
Port
587
Username
[email protected]
Password
susila@22

Signatures

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

MassLogger Main Payload 4 IoCs

resource	yara_rule
behavioral1/memory/1636-8-0x0000000000400000-0x0000000000486000-memory.dmp	family_masslogger
behavioral1/memory/1636-9-0x000000000048184E-mapping.dmp	family_masslogger
behavioral1/memory/1636-10-0x0000000000400000-0x0000000000486000-memory.dmp	family_masslogger
behavioral1/memory/1636-11-0x0000000000400000-0x0000000000486000-memory.dmp	family_masslogger

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Local\\Temp\\TIRNAK.exe\""	TIRNAK.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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Control Panel\International\Geo\Nation	TIRNAK.exe

Deletes itself 1 IoCs

pid	Process
756	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\TIRNAK.exe	TIRNAK.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\TIRNAK.exe	TIRNAK.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

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Windows\CurrentVersion\Run\<Unknown> = "C:\\Users\\Admin\\AppData\\Local\\Temp\\TIRNAK.exe"	TIRNAK.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Windows\CurrentVersion\Run\TIRNAK.exe = "C:\\Users\\Admin\\AppData\\Local\\Temp\\TIRNAK.exe"	TIRNAK.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
8	api.ipify.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1668 set thread context of 1636	1668	TIRNAK.exe	32

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2044	timeout.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1636	TIRNAK.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1636	TIRNAK.exe
1636	TIRNAK.exe
1636	TIRNAK.exe
1636	TIRNAK.exe
536	powershell.exe
536	powershell.exe
756	powershell.exe
756	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1668	TIRNAK.exe
Token: SeDebugPrivilege	1636	TIRNAK.exe
Token: SeDebugPrivilege	536	powershell.exe
Token: SeDebugPrivilege	756	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1636	TIRNAK.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 1668 wrote to memory of 836	1668	TIRNAK.exe	26
PID 1668 wrote to memory of 836	1668	TIRNAK.exe	26
PID 1668 wrote to memory of 836	1668	TIRNAK.exe	26
PID 1668 wrote to memory of 836	1668	TIRNAK.exe	26
PID 836 wrote to memory of 2044	836	cmd.exe	28
PID 836 wrote to memory of 2044	836	cmd.exe	28
PID 836 wrote to memory of 2044	836	cmd.exe	28
PID 836 wrote to memory of 2044	836	cmd.exe	28
PID 1668 wrote to memory of 1636	1668	TIRNAK.exe	32
PID 1668 wrote to memory of 1636	1668	TIRNAK.exe	32
PID 1668 wrote to memory of 1636	1668	TIRNAK.exe	32
PID 1668 wrote to memory of 1636	1668	TIRNAK.exe	32
PID 1668 wrote to memory of 1636	1668	TIRNAK.exe	32
PID 1668 wrote to memory of 1636	1668	TIRNAK.exe	32
PID 1668 wrote to memory of 1636	1668	TIRNAK.exe	32
PID 1668 wrote to memory of 1636	1668	TIRNAK.exe	32
PID 1668 wrote to memory of 1636	1668	TIRNAK.exe	32
PID 1636 wrote to memory of 536	1636	TIRNAK.exe	34
PID 1636 wrote to memory of 536	1636	TIRNAK.exe	34
PID 1636 wrote to memory of 536	1636	TIRNAK.exe	34
PID 1636 wrote to memory of 536	1636	TIRNAK.exe	34
PID 1636 wrote to memory of 756	1636	TIRNAK.exe	36
PID 1636 wrote to memory of 756	1636	TIRNAK.exe	36
PID 1636 wrote to memory of 756	1636	TIRNAK.exe	36
PID 1636 wrote to memory of 756	1636	TIRNAK.exe	36

C:\Users\Admin\AppData\Local\Temp\TIRNAK.exe
"C:\Users\Admin\AppData\Local\Temp\TIRNAK.exe"
1⤵
- Modifies WinLogon for persistence
- Drops startup file
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1668
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout 4.903
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:836
- - C:\Windows\SysWOW64\timeout.exe
    timeout 4.903
    3⤵
    - Delays execution with timeout.exe
    PID:2044
- C:\Users\Admin\AppData\Local\Temp\TIRNAK.exe
  "C:\Users\Admin\AppData\Local\Temp\TIRNAK.exe"
  2⤵
  - Checks computer location settings
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1636
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\TIRNAK.exe'
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:536
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Start-Sleep -Seconds 2; Remove-Item -path 'C:\Users\Admin\AppData\Local\Temp\TIRNAK.exe'
    3⤵
    - Deletes itself
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:756

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

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/536-31-0x00000000060E0000-0x00000000060E1000-memory.dmp

Download

memory/536-53-0x0000000006300000-0x0000000006301000-memory.dmp

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memory/536-16-0x0000000073910000-0x0000000073FFE000-memory.dmp

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memory/536-19-0x0000000001DC0000-0x0000000001DC1000-memory.dmp

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memory/536-20-0x00000000047D0000-0x00000000047D1000-memory.dmp

Download

memory/536-21-0x0000000002520000-0x0000000002521000-memory.dmp

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memory/536-22-0x00000000052E0000-0x00000000052E1000-memory.dmp

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memory/536-25-0x0000000006060000-0x0000000006061000-memory.dmp

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memory/536-30-0x00000000060A0000-0x00000000060A1000-memory.dmp

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memory/536-54-0x0000000006310000-0x0000000006311000-memory.dmp

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memory/536-38-0x0000000006280000-0x0000000006281000-memory.dmp

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memory/536-39-0x0000000005610000-0x0000000005611000-memory.dmp

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memory/756-57-0x0000000074640000-0x0000000074D2E000-memory.dmp

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memory/756-72-0x00000000057E0000-0x00000000057E1000-memory.dmp

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memory/756-71-0x0000000006230000-0x0000000006231000-memory.dmp

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memory/756-58-0x0000000002400000-0x0000000002401000-memory.dmp

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memory/756-59-0x0000000004910000-0x0000000004911000-memory.dmp

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memory/756-60-0x0000000002690000-0x0000000002691000-memory.dmp

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memory/756-61-0x00000000053F0000-0x00000000053F1000-memory.dmp

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memory/1636-12-0x0000000073910000-0x0000000073FFE000-memory.dmp

Download

memory/1636-11-0x0000000000400000-0x0000000000486000-memory.dmp

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memory/1636-10-0x0000000000400000-0x0000000000486000-memory.dmp

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memory/1636-8-0x0000000000400000-0x0000000000486000-memory.dmp

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memory/1636-17-0x0000000005330000-0x0000000005369000-memory.dmp

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memory/1636-18-0x0000000006070000-0x00000000060FD000-memory.dmp

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memory/1668-7-0x0000000000570000-0x0000000000604000-memory.dmp

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memory/1668-2-0x0000000074640000-0x0000000074D2E000-memory.dmp

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memory/1668-3-0x00000000008C0000-0x00000000008C1000-memory.dmp

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