masslogger | e9575adae2fa6afb6b8d8fb098feec9d4acbadabda4beeca90433b578cd6afa1

Analysis

max time kernel
19s
max time network
105s
platform
windows10_x64
resource
win10v20201028
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

Signatures

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

MassLogger Main Payload 2 IoCs

resource	yara_rule
behavioral2/memory/3764-12-0x0000000000400000-0x0000000000486000-memory.dmp	family_masslogger
behavioral2/memory/3764-13-0x000000000048184E-mapping.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-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Local\\Temp\\TIRNAK.exe\""	TIRNAK.exe

Deletes itself 1 IoCs

pid	Process
1388	powershell.exe

Drops startup file 2 IoCs

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

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-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\<Unknown> = "C:\\Users\\Admin\\AppData\\Local\\Temp\\TIRNAK.exe"	TIRNAK.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\TIRNAK.exe = "C:\\Users\\Admin\\AppData\\Local\\Temp\\TIRNAK.exe"	TIRNAK.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 652 set thread context of 3764	652	TIRNAK.exe	80

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2076	timeout.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3764	TIRNAK.exe
3764	TIRNAK.exe
1388	powershell.exe
1388	powershell.exe
1388	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	652	TIRNAK.exe
Token: SeDebugPrivilege	3764	TIRNAK.exe
Token: SeDebugPrivilege	1388	powershell.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 652 wrote to memory of 3480	652	TIRNAK.exe	75
PID 652 wrote to memory of 3480	652	TIRNAK.exe	75
PID 652 wrote to memory of 3480	652	TIRNAK.exe	75
PID 3480 wrote to memory of 2076	3480	cmd.exe	77
PID 3480 wrote to memory of 2076	3480	cmd.exe	77
PID 3480 wrote to memory of 2076	3480	cmd.exe	77
PID 652 wrote to memory of 3764	652	TIRNAK.exe	80
PID 652 wrote to memory of 3764	652	TIRNAK.exe	80
PID 652 wrote to memory of 3764	652	TIRNAK.exe	80
PID 652 wrote to memory of 3764	652	TIRNAK.exe	80
PID 652 wrote to memory of 3764	652	TIRNAK.exe	80
PID 652 wrote to memory of 3764	652	TIRNAK.exe	80
PID 652 wrote to memory of 3764	652	TIRNAK.exe	80
PID 652 wrote to memory of 3764	652	TIRNAK.exe	80
PID 3764 wrote to memory of 1388	3764	TIRNAK.exe	82
PID 3764 wrote to memory of 1388	3764	TIRNAK.exe	82
PID 3764 wrote to memory of 1388	3764	TIRNAK.exe	82

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:652
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout 4.903
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3480
- - C:\Windows\SysWOW64\timeout.exe
    timeout 4.903
    3⤵
    - Delays execution with timeout.exe
    PID:2076
- C:\Users\Admin\AppData\Local\Temp\TIRNAK.exe
  "C:\Users\Admin\AppData\Local\Temp\TIRNAK.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3764
- - 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:1388

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

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/652-11-0x0000000007270000-0x0000000007271000-memory.dmp

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memory/652-3-0x0000000000550000-0x0000000000551000-memory.dmp

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memory/652-5-0x0000000004DA0000-0x0000000004DA1000-memory.dmp

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memory/652-6-0x0000000005490000-0x0000000005491000-memory.dmp

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memory/652-2-0x0000000073FF0000-0x00000000746DE000-memory.dmp

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memory/652-9-0x0000000004820000-0x00000000048B4000-memory.dmp

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memory/652-10-0x00000000072A0000-0x00000000072A1000-memory.dmp

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memory/1388-29-0x0000000007950000-0x0000000007951000-memory.dmp

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memory/1388-35-0x0000000007440000-0x0000000007441000-memory.dmp

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memory/1388-34-0x0000000009960000-0x0000000009961000-memory.dmp

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memory/1388-33-0x0000000009560000-0x0000000009561000-memory.dmp

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memory/1388-32-0x0000000009FE0000-0x0000000009FE1000-memory.dmp

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memory/1388-31-0x0000000008930000-0x0000000008931000-memory.dmp

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memory/1388-22-0x0000000074070000-0x000000007475E000-memory.dmp

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memory/1388-23-0x0000000004D90000-0x0000000004D91000-memory.dmp

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memory/1388-24-0x0000000007970000-0x0000000007971000-memory.dmp

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memory/1388-25-0x00000000077E0000-0x00000000077E1000-memory.dmp

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memory/1388-26-0x0000000007880000-0x0000000007881000-memory.dmp

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memory/1388-28-0x00000000082F0000-0x00000000082F1000-memory.dmp

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memory/1388-30-0x0000000008640000-0x0000000008641000-memory.dmp

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memory/3764-12-0x0000000000400000-0x0000000000486000-memory.dmp

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memory/3764-20-0x0000000005950000-0x0000000005951000-memory.dmp

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memory/3764-15-0x0000000073FF0000-0x00000000746DE000-memory.dmp

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