arrow_back
search
close

RANSOM_LAMBDALOCKER.A

April 17, 2017
 Analysis by: Ryan Paolo Maglaque
 ALIASES:

Ransom.CryptXXX(Norton);Ransom:Win32/Genasom(Microsoft);Python/Filecoder.LambdaLocker.A(Eset-NOD32)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

8436031 bytes

File Type:

EXE

File Compression:

UPX

Memory Resident:

Yes

Initial Samples Received Date:

05 Apr 2017

Payload:

Encrypts files, Displays message/message boxes

Arrival Details

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Ransomware drops the following copies of itself into the affected system and executes them:

  • %System Root%\reloader.exe

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It drops the following files:

  • {Malware Directory}\s.bat
  • %User Temp%\{random hex}
  • %System Root%\READ_IT.hTmL ← Ransom Note
  • %System Root%\lalover.inf0
  • %System Root%\lf.Lst ← List of encrypted files

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It creates the following folders:

  • %User Temp%\_MEI{Random Numbers}\ ← Contains components

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Ransomware encrypts files with the following extensions:

  • .rc
  • .rb
  • .cs
  • .key
  • .dwg
  • .conf
  • .hvm
  • .rpm
  • .iso
  • .vti
  • .mca
  • .raw
  • .crt
  • .rar
  • .pot
  • .mid
  • .xlam
  • .aac
  • .avi
  • .bmp
  • .pptm
  • .eif
  • .dot
  • .php
  • .csv
  • .wma
  • .ec
  • .et
  • .wmv
  • .sln
  • .pl
  • .des
  • .htm
  • sqlitedb
  • .7z
  • .e
  • .mdf
  • .jpg
  • .cpp
  • .dbf
  • .ps
  • .htm
  • .saz
  • .lua
  • .asp
  • .gpg
  • .vba
  • .class
  • .deb
  • .xz
  • .asc
  • .xltx
  • .vbs
  • .rsa
  • .cap
  • .asm
  • .sh
  • .dmp
  • .psd
  • .xls
  • .xlt
  • .app
  • .pdf
  • .img
  • .ora
  • .pub
  • .html
  • .apk
  • .dds
  • .str
  • .fly
  • .aspx
  • .tif
  • .mpeg
  • .ps1
  • .bak
  • .gif
  • .ppt
  • .config
  • .pps
  • .rtf
  • sqlite3
  • .mov
  • .csv
  • .docm
  • .frm
  • .sxp
  • .rdp
  • .bz2
  • .vmdk
  • .xlsm
  • .id
  • .aes
  • .ns
  • .vdi
  • .ldf
  • .wps
  • .wpt
  • .sql
  • .c
  • .opt
  • .wav
  • .lock
  • .hta
  • .war
  • .jar
  • .txt
  • .pptx
  • .mdb
  • .xltm
  • .odb
  • .rmvb
  • .odt
  • .md
  • .docx
  • .b64
  • .xlsx
  • .dotx
  • .xlsb
  • .doc
  • .svg
  • .dotm
  • .dbc
  • .out
  • .nsf
  • .base64
  • .myd
  • .ppsx
  • .map
  • .myi
  • .jsp
  • .dps
  • .ett
  • .zip
  • .dpt
  • .png
  • .jspx
  • .tar
  • .flac
  • .key
  • .swf
  • .mp3
  • .java
  • .gz
  • .mp4
  • .gho
  • .eml

It renames encrypted files using the following names:

  • {Original File Name and Extension}.lambda_l0cked

It does the following:

  • Avoids encrypting files in %Windows% directory
  • Drops the following ransom note:
  • Run {Malware Directory}\s.bat to execute the following commands:
    • sc stop mysql
    • sc stop MySQL56
    • sc stop mssqlserver
    • sc stop OracleServiceORCL
    • sc stop MongoDB
    • sc stop MariaDB
    • sc stop postgresql
    • taskkill /IM mysql.exe /f
    • taskkill /IM oracle.exe /f
    • taskkill /IM sqlserver.exe /f
    • taskkill /IM Apache.exe /f
  • Tries to delete itself by executing the following command: cmd.exe /c cd /d {Malware Directory}&ping -n 3 127.0.0.1&del {Malware File}

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.322.01

FIRST VSAPI PATTERN DATE:

05 Apr 2017

VSAPI OPR PATTERN File:

13.323.00

VSAPI OPR PATTERN Date:

06 Apr 2017

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Temp%\_MEI{Random Numbers}

Step 5

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • {Malware Directory}\s.bat
  • %User Temp%\{random hex}
  • %System Root%\READ_IT.hTmL
  • %System Root%\lalover.inf0
  • %System Root%\lf.Lst

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_LAMBDALOCKER.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 7

Restore encrypted files from backup.


Did this description help? Tell us how we did.