Ransom_BAKSOCUTE.A
Trojan:Win32/Dynamer!ac(Microsoft); Trojan.Win32.Poweliks.zx(Kaspersky); MSIL/Filecoder.BQ!tr(Fortinet)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Trojan 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
240,128 bytes
EXE
No
05 Aug 2016
Connects to URLs/IPs, Encrypts files
Arrival Details
This Trojan 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 Trojan adds the following processes:
- %System%\rundll32.exe javascript:"\..\mshtml,RunHTMLApplication ";document.write();shell=new%20ActiveXObject("wscript.shell");shell.regwrite("HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce\adr","{malware path and filename}");
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- BaksoCrypt
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
adr = {malware path and filename}
Other Details
This Trojan encrypts files with the following extensions:
- .png
- .3dm
- .3g2
- .3gp
- .aaf
- .accdb
- .aep
- .aepx
- .aet
- .ai
- .aif
- .arw
- .as
- .as3
- .asf
- .asp
- .asx
- .avi
- .bay
- .bmp
- .cdr
- .cer
- .class
- .cpp
- .cr2
- .crt
- .crw
- .cs
- .csv
- .db
- .dbf
- .dcr
- .der
- .dng
- .doc
- .docb
- .docm
- .docx
- .dot
- .dotm
- .dotx
- .dwg
- .dxf
- .dxg
- .efx
- .eps
- .erf
- .fla
- .flv
- .idml
- .iff
- .indb
- .indd
- .indl
- .indt
- .inx
- .jar
- .java
- .jpeg
- .jpg
- .kdc
- .m3u
- .m3u8
- .m4u
- .max
- .mdb
- .mdf
- .mef
- .mid
- .mov
- .mp3
- .mp4
- .mpa
- .mpeg
- .mpg
- .mrw
- .msg
- .nef
- .nrw
- .odb
- .odc
- .odm
- .odp
- .ods
- .odt
- .orf
- .p12
- .p7b
- .p7c
- .pdb
- .pef
- .pem
- .pfx
- .php
- .plb
- .pmd
- .pot
- .potm
- .potx
- .ppam
- .ppj
- .pps
- .ppsm
- .ppsx
- .ppt
- .pptm
- .pptx
- .prel
- .prproj
- .ps
- .psd
- .pst
- .ptx
- .r3d
- .ra
- .raf
- .rar
- .raw
- .rb
- .rtf
- .rw2
- .rwl
- .sdf
- .sldm
- .sldx
- .sql
- .sr2
- .srf
- .srw
- .svg
- .swf
- .tif
- .vcf
- .vob
- .wav
- .wb2
- .wma
- .wmv
- .wpd
- .wps
- .x3f
- .xla
- .xlam
- .xlk
- .xll
- .xlm
- .xls
- .xlsb
- .xlsm
- .xlsx
- .xlt
- .xltm
- .xltx
- .xlw
- .xml
- .xqx
- .zip
It renames encrypted files using the following names:
- {random filename}.adr
It drops the following file(s)/component(s):
- {malware path}\kembalian.txt - contains RSA key
- {malware path}\mangkokAES.txt - contains encrypted AES key
- {malware path}\data receive - contains machine name and RSA key
It does the following:
- It encrypts the files found in the following directories:
- %Desktop%\
- %Desktop%\{subfolders}\
(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.)
SOLUTION
9.800
12.696.01
05 Aug 2016
12.697.00
06 Aug 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
Scan your computer with your Trend Micro product to delete files detected as Ransom_BAKSOCUTE.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 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- adr = {malware path and filename}
- adr = {malware path and filename}
Step 5
Search and delete these files
- {malware path}\kembalian.txt
- {malware path}\mangkokAES.txt
- {malware path}\data receive
Step 6
Restore encrypted files from backup.
Did this description help? Tell us how we did.