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Ransom.Win64.CRYPTGO.AA

June 12, 2019
 Analysis by: Jay Bradley Nebre
 ALIASES:

Trojan:Win32/Occamy.C(Microsoft); Trojan-Ransom.Win32.Crypmod.abdj(Kaspersky))

 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, Dropped by other malware


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.

It encrypts files with specific file extensions. It drops files as ransom note.

  TECHNICAL DETAILS

File Size:

3,814,912 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

11 Jun 2019

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.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .jpg
  • .jpeg
  • .raw
  • .tif
  • .gif
  • .png
  • .bmp
  • .3dm
  • .max
  • .accdb
  • .db
  • .dbf
  • .mdb
  • .pdb
  • .sql
  • .dwg
  • .dxf
  • .cpp
  • .cs
  • .h
  • .php
  • .asp
  • .rb
  • .java
  • .jar
  • .class
  • .py
  • .js
  • .aaf
  • .aep
  • .aepx
  • .plb
  • .prel
  • .prproj
  • .aet
  • .ppj
  • .psd
  • .indd
  • .indl
  • .indt
  • .indb
  • .inx
  • .idml
  • .pmd
  • .xqx
  • .xqx
  • .ai
  • .eps
  • .ps
  • .svg
  • .swf
  • .fla
  • .as3
  • .as
  • .txt
  • .doc
  • .dot
  • .docx
  • .docm
  • .dotx
  • .dotm
  • .docb
  • .rtf
  • .wpd
  • .wps
  • .msg
  • .pdf
  • .xls
  • .xlt
  • .xlm
  • .xlsx
  • .xlsm
  • .xltx
  • .xltm
  • .xlsb
  • .xla
  • .xlam
  • .xll
  • .xlw
  • .ppt
  • .pot
  • .pps
  • .pptx
  • .pptm
  • .potx
  • .potm
  • .ppam
  • .ppsx
  • .ppsm
  • .sldx
  • .sldm
  • .wav
  • .mp3
  • .aif
  • .iff
  • .m3u
  • .m4u
  • .mid
  • .mpa
  • .wma
  • .ra
  • .avi
  • .mov
  • .mp4
  • .3gp
  • .mpeg
  • .3g2
  • .asf
  • .asx
  • .flv
  • .mpg
  • .wmv
  • .vob
  • .m3u8
  • .dat
  • .csv
  • .efx
  • .sdf
  • .vcf
  • .xml
  • .ses
  • .qbw
  • .qbb
  • .qbm
  • .qbi
  • .qbr
  • .cnt
  • .des
  • .v30
  • .qbo
  • .ini
  • .lgb
  • .qwc
  • .qbp
  • .aif
  • .qba
  • .tlg
  • .qbx
  • .qby
  • .1pa
  • .qpd
  • .txt
  • .set
  • .iif
  • .nd
  • .rtp
  • .tlg
  • .wav
  • .qsm
  • .qss
  • .qst
  • .fx0
  • .fx1
  • .mx0
  • .fpx
  • .fxr
  • .fim
  • .ptb
  • .ai
  • .pfb
  • .cgn
  • .vsd
  • .cdr
  • .cmx
  • .cpt
  • .csl
  • .cur
  • .des
  • .dsf
  • .ds4
  • .drw
  • .eps
  • .ps
  • .prn
  • .gif
  • .pcd
  • .pct
  • .pcx
  • .plt
  • .rif
  • .svg
  • .swf
  • .tga
  • .tiff
  • .psp
  • .ttf
  • .wpd
  • .wpg
  • .wi
  • .raw
  • .wmf
  • .txt
  • .cal
  • .cpx
  • .shw
  • .clk
  • .cdx
  • .cdt
  • .fpx
  • .fmv
  • .img
  • .gem
  • .xcf
  • .pic
  • .mac
  • .met
  • .pp4
  • .pp5
  • .ppf
  • .nap
  • .pat
  • .ps
  • .prn
  • .sct
  • .vsd
  • .wk3
  • .wk4
  • .xpm
  • .zip
  • .rar

It renames encrypted files using the following names:

  • {encrypted file}.jupstb

It drops the following file(s) as ransom note:

  • Readme_Restore_Files.txt

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.814.01

FIRST VSAPI PATTERN DATE:

14 Feb 2019

VSAPI OPR PATTERN File:

14.815.00

VSAPI OPR PATTERN Date:

15 Feb 2019

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win64.CRYPTGO.AA. 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 the following Trend Micro Support pages for more information:

Step 3

Restore encrypted files from backup.


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