TrojanSpy.Win32.EMOTET.THDCOAI

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

It executes then deletes itself afterward.

It connects to a website to send and receive information.

However, as of this writing, the said sites are inaccessible.

Arrival Details

This Trojan Spy 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 Spy drops the following copies of itself into the affected system:

• If sample executed with administrative privileges:
  • %System%\{String1}{String2}.exe
• If sample executed without administrative privileges:
  • %AppDataLocal%\{String1}{String2}\{String1}{String2}.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

• {Malware file path}\{Malware file name}.exe --{8 Random Characters}
• If sample executed with administrative privileges:
  • %System%\{String1}{String2}.exe
  • %System%\{String1}{String2}.exe --{8 Random Characters}
• If sample executed without administrative privileges:
  • %AppDataLocal%\{String1}{String2}\{String1}{String2}.exe
  • %AppDataLocal%\{String1}{String2}\{String1}{String2}.exe --{8 Random Characters}

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

• If the sample is executed without administrative privileges:
  • %AppDataLocal%\{String1}{String2}

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It executes then deletes itself afterward.

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• Global\I{Volume Serial Number}
• Global\M{Volume Serial Number}

Autostart Technique

This Trojan Spy registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{String1}{String2}
ImagePath = %System%\{String1}{String2}.exe

It adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{String1}{String2} = %AppDataLocal%\{String1}{String2}\{String1}{String2}.exe

Backdoor Routine

This Trojan Spy connects to the following websites to send and receive information:

• {BLOCKED}.{BLOCKED}.252.27:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.252.249:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.254.93:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.117.247:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.212.42:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.67.226:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.203.51:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.160.193:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.35.103:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.45.129:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.131.215:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.142.40:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.148.222:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.200.27:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.86.72:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.143.100:7080/{Random Characters}
• {BLOCKED}.{BLOCKED}.50.164:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.93.123:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.206.153:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.248.48:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.215.57:7080/{Random Characters}
• {BLOCKED}.{BLOCKED}.1.74:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.79.48:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.163:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.112.70:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.185.71:465/{Random Characters}
• {BLOCKED}.{BLOCKED}.213.173:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.62.186:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.33.82:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.6.78:7080/{Random Characters}
• {BLOCKED}.{BLOCKED}.90.90:7080/{Random Characters}
• {BLOCKED}.{BLOCKED}.69.165:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.85.35:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.105.16:465/{Random Characters}
• {BLOCKED}.{BLOCKED}.199.254:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.94.183:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.52.242:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.252.27:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.252.249:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.254.93:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.117.247:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.212.42:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.67.226:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.203.51:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.160.193:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.35.103:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.45.129:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.131.215:443/{Random Characters}
• {BLOCKED}.{BLOCKED}.142.40:8080/{Random Characters}
• {BLOCKED}.{BLOCKED}.148.222:8080/{Random Characters}

Information Theft

This Trojan Spy gathers the following data:

• Computer Name
• Process SessionId
• OS Version
• Running Processes
• File CRC
• Processor Architecture

Other Details

This Trojan Spy does the following:

• It creates the service for persistence if the sample is executed with administrative privileges, otherwise it uses an autorun registry.
• It combines any two of the following strings and uses it as its filename "{String1}{String2}":
  • rel
  • tables
  • glue
  • impl
  • texture
  • related
  • key
  • nis
  • langs
  • iprop
  • exec
  • wrap
  • matrix
  • dump
  • phoenix
  • ribbon
  • sorting
  • pinned
  • lics
  • bit
  • unpack
  • adt
  • rep
  • jobs
  • acl
  • title
  • sound
  • events
  • targets
  • scrn
  • mheg
  • lines
  • prompt
  • adjust
  • xian
  • ser
  • cycle
  • redist
  • its
  • boxes
  • dma
  • small
  • cloud
  • flow
  • guiddef
  • whole
  • parent
  • bears
  • random
  • bulk
  • idebug
  • viewer
  • starta
  • comment
  • sel
  • source
  • hotspot
  • pnf
  • portal
  • sitka
  • iell
  • slide
  • typ
  • sonic
• It deletes outdated copies of itself with a combination of any two of the following strings as its file name:
  • not
  • ripple
  • svcs
  • serv
  • wab
  • shader
  • single
  • without
  • wcs
  • define
  • eap
  • culture
  • slide
  • zip
  • tmpl
  • mini
  • polic
  • panes
  • earcon
  • menus
  • detect
  • form
  • uuidgen
  • pnp
  • admin
  • tuip
  • avatar
  • started
  • dasmrc
  • alaska
  • guids
  • wfp
  • adam
  • wgx
  • lime
  • indexer
  • repl
  • dev
  • mapi
  • resw
  • daf
  • diag
  • iss
  • vsc
  • turned
  • neutral
  • sat
  • source
  • enroll
  • mfidl
  • idl
  • based
  • right
  • cbs
  • radar
  • avg
  • wordpad
  • metagen
  • mouse
  • iprop
  • mdmmcd
  • jersey
  • thunk
  • subs

However, as of this writing, the said sites are inaccessible.