Threat Encyclopedia

RANSOM_MEMEKAP.A

Publish date: January 26, 2016

ANALYSIS BY

Rhena Inocencio


ALIASES:

Ransom:MSIL/Memekap.A (Microsoft)

PLATFORM:

Windows

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

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted: No

  • In the wild: Yes

OVERVIEW

Infection Channel:

Downloaded from the Internet


This is the detection for another variant of ransomware dubbed as “magic ransomware,” which may be the updated version of EDA2. EDA2 is an open source ransomware created by Utkusen.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan may be downloaded by other malware/grayware/spyware from remote sites.

TECHNICAL DETAILS

File Size:

26,624 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

25 Jan 2016

Payload:

Drops files, Encrypts files

Arrival Details

This Trojan may be downloaded by other malware/grayware/spyware from remote sites.

Installation

This Trojan drops the following files:

  • %Desktop%\DECRYPT_ReadMe.TXT.ReadMe - contains ransom note
  • %Desktop%\DECRYPT.TXT - contains ransom note

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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.)

It drops the following component file(s):

  • %Desktop%\deleteMyProgram.bat
    This component is used to delete shadow volume copies by executing the following command:
    vssadmin.exe Delete Shadows /All /Quiet

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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 Trojan encrypts files with the following extensions:

  • .odp
  • .ods
  • .pab
  • .pkb
  • .pkh
  • .pot
  • .potx
  • .pptm
  • .psa
  • .qdf
  • .qel
  • .rgn
  • .rrt
  • .rsw
  • .rte
  • .sdb
  • .sdc
  • .sds
  • .sql
  • .stt
  • .tcx
  • .thmx
  • .txd
  • .txf
  • .upoi
  • .vmt
  • .wks
  • .wmdb
  • .xlc
  • .xlr
  • .xlsb
  • .xltx
  • .ltm
  • .xlwx
  • .mcd
  • .cap
  • .cod
  • .cpp
  • .csi
  • .dcp
  • .dcu
  • .dev
  • .dob
  • .dox
  • .dpk
  • .dpl
  • .dpr
  • .dsk
  • .dsp
  • .eql
  • .fla
  • .for
  • .fpp
  • .jav
  • .java
  • .lbi
  • .owl
  • .plc
  • .pli
  • .res
  • .rsrc
  • .swd
  • .tpu
  • .tpx
  • .tur
  • .yab
  • .aip
  • .amxx
  • .ape
  • .api
  • .mxp
  • .oxt
  • .qpx
  • .qtr
  • .xla
  • .xlam
  • .xll
  • .xlv
  • .xpt
  • .cfg
  • .cwf
  • .dbb
  • .slt
  • .bpl
  • .clr
  • .dbx
  • .potm
  • .ppsm
  • .prc
  • .prt
  • .shw
  • .std
  • .ver
  • .wpl
  • .xlm
  • .yps
  • .bck
  • .html
  • .bak
  • .odt
  • .pst
  • .log
  • .mpg
  • .mpeg
  • .odb
  • .wps
  • .xlk
  • .mdb
  • .dxg
  • .wpd
  • .dbf
  • .arw
  • .srf
  • .bay
  • .crw
  • .dcr
  • .kdc
  • .erf
  • .mef
  • .mrw
  • .nef
  • .nrw
  • .orf
  • .raf
  • .rwl
  • .ptx
  • .pef
  • .srw
  • .der
  • .pem
  • .pfx
  • .jfif
  • .exif
  • .asf
  • .pdf
  • .xls
  • .docx
  • .xlsx
  • .waw
  • .jpg
  • .jpeg
  • .txt
  • .rtf
  • .doc
  • .rar
  • .zip
  • .psd
  • .tif
  • .wma
  • .gif
  • .bmp
  • .ppt
  • .pptx
  • .docm
  • .xlsm
  • .pps
  • .ppsx
  • .ppd
  • .eps
  • .png
  • .ace
  • .djvu
  • .tar
  • .cdr
  • .max
  • .wmv
  • .avi
  • .wav
  • .pdd
  • .php
  • .aac
  • .amf
  • .amr
  • .dwg
  • .dxf
  • .accdb
  • .mod
  • .tax2013
  • .tax2014
  • .oga
  • .ogg
  • .pbf
  • .raw
  • .saf
  • .val
  • .wave
  • .wow
  • .wpk
  • .amx
  • .avs
  • .bik
  • .dir
  • .divx
  • .dvx
  • .evo
  • .flv
  • .qtq
  • .tch
  • .rts
  • .rum
  • .scn
  • .srt
  • .stx
  • .svi
  • .swf
  • .trp
  • .vdo
  • .wmd
  • .wmmp
  • .wmx
  • .wvx
  • .xvid
  • .pbs
  • .adi
  • .ais
  • .amu
  • .arr
  • .bmc
  • .bmf
  • .cag
  • .cam
  • .dng
  • .ink
  • .jif
  • .jiff
  • .jpc
  • .jpf
  • .jpw
  • .mag
  • .mic
  • .mip
  • .msp
  • .nav
  • .ncd
  • .odc
  • .odi
  • .opf
  • .qif
  • .xwd
  • .abw
  • .act
  • .adt
  • .aim
  • .ans
  • .asc
  • .ase
  • .bdp
  • .bdr
  • .bib
  • .boc
  • .crd
  • .diz
  • .dot
  • .dotm
  • .dotx
  • .dvi
  • .dxe
  • .mlx
  • .err
  • .euc
  • .faq
  • .fdr
  • .fds
  • .gthr
  • .idx
  • .kwd
  • .ltr
  • .man
  • .mbox
  • .msg
  • .nfo
  • .now
  • .odm
  • .oft
  • .pwi
  • .rng
  • .rtx
  • .run
  • .ssa
  • .text
  • .unx
  • .wbk
  • .wsh
  • .arc
  • .ari
  • .arj
  • .car
  • .cbr
  • .cbz
  • .gzig
  • .jgz
  • .pak
  • .pcv
  • .puz
  • .rev
  • .sdn
  • .sen
  • .sfs
  • .sfx
  • .shar
  • .shr
  • .sqx
  • .tbz2
  • .tlz
  • .vsi
  • .wad
  • .war
  • .xpi
  • .zap
  • .zipx
  • .zoo
  • .ipa
  • .isu
  • .jar
  • .udf
  • .adr
  • .aro
  • .asa
  • .ascx
  • .ashx
  • .asmx
  • .asp
  • .indd
  • .asr
  • .qbb
  • .bml
  • .cer
  • .cms
  • .crt
  • .dap
  • .htm
  • .moz
  • .svr
  • .url
  • .wdgt
  • .abk
  • .bic
  • .big
  • .blp
  • .bsp
  • .cgf
  • .chk
  • .col
  • .cty
  • .dem
  • .elf
  • .gam
  • .grf
  • .iwd
  • .ldb
  • .lgp
  • .lvl
  • .map
  • .mdl
  • .nds
  • .pbp
  • .ppf
  • .pwf
  • .pxp
  • .sad
  • .sav
  • .scm
  • .scx
  • .sdt
  • .spr
  • .sud
  • .uax
  • .umx
  • .unr
  • .uop
  • .usa
  • .usx
  • .utc
  • .utx
  • .uvx
  • .uxx
  • .vmf
  • .vtf
  • .wtd
  • .wtf
  • .ccd
  • .cso
  • .disk
  • .dmg
  • .dvd
  • .fcd
  • .flp
  • .img
  • .isz
  • .mdf
  • .mds
  • .nrg
  • .nri
  • .vcd
  • .vhd
  • .snp
  • .bkf
  • .ade
  • .adpb
  • .dic
  • .cch
  • .ctt
  • .dal
  • .ddc
  • .ddcx
  • .dex
  • .dif
  • .dii
  • .itdb
  • .itl
  • .kmz
  • .lcd
  • .lcf
  • .mbx
  • .mdn
  • .odf

NOTES:

It exempts encryption of files in locations contaning the following strings:

  • C:\windows
  • C:\program

The ransom note contains the following details:

All your files encrypted with strong encryption.
To unlock your files you must pay 1 bitcoin to address :
{BLOCKED}CBaHcgc6LaLfR
You can search google for how to buy and send bitcoin in your country.
After you send the bitcoin email to :
{BLCOKED}1@gmail.com
{BLOCKED}ne@mail.ru
{BLOCKED}990@safe-mail.net
use all email to communicate
with the information of username and pcname and the time you send bitcoins.
When we will confirme the transaction you will receive decryption key and decryption program.
Price depend on the system.If you have a sql server or server based system send 2 bitcoin.
If your network share or system encrypted with axx extensions email to discuss price to decrypt your system.

SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.296.03

FIRST VSAPI PATTERN DATE:

25 Jan 2016

VSAPI OPR PATTERN File:

12.297.00

VSAPI OPR PATTERN Date:

26 Jan 2016

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

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.
 
  • %Desktop%\DECRYPT.TXT
  • %Desktop%\DECRYPT_ReadMe.TXT.ReadMe
  • %Desktop%\\deleteMyProgram.bat

Step 4

Scan your computer with your Trend Micro product to delete files detected as RANSOM_MEMEKAP.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 5

Restore encrypted files from backup.


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