TSPY_EMOTET.AUSJLA
Trojan.Emotet (Malwarebytes), DDOS.Botnet.Zyklon (Ikarus), Troj/Emotet-FL (Sophos AV)
Windows
Threat Type: Trojan Spy
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This information stealing malware arrives as spam spoofing an invoice or payment notification. If the user clicks the URL in the email, it executes a PowerShell command that downloads EMOTET. It then gathers information on the affected system and sends the information to a C&C server to determine the payload to be sent to the affected system. One of the possible payloads includes DRIDEX, a popular banking trojan.
This Trojan Spy may be downloaded by other malware/grayware from remote sites.
It connects to certain websites to send and receive information. It deletes the initially executed copy of itself.
TECHNICAL DETAILS
Arrival Details
This Trojan Spy may be downloaded by the following malware/grayware from remote sites:
Installation
This Trojan Spy drops the following copies of itself into the affected system:
- %AppDataLocal%\Microsoft\Windows\{string 1}{string 2}.exe - drops the file here if it has no admin privileges
- %System%\{string 1}{string 2}.exe - drops the file here if it has admin privileges
where {string 1} and {string 2} is a combination of any of the following strings:- agent
- app
- audio
- bio
- bits
- cache
- card
- cart
- cert
- com
- crypt
- dcom
- defrag
- device
- dhcp
- dns
- event
- evt
- flt
- gdi
- group
- help
- home
- host
- info
- iso
- launch
- log
- logon
- lookup
- man
- math
- mgmt
- msi
- ncb
- net
- nv
- nvidia
- proc
- prop
- prov
- provider
- reg
- rpc
- screen
- search
- sec
- server
- service
- shed
- shedule
- spec
- srv
- storage
- svc
- sys
- system
- task
- time
- video
- view
- win
- window
- wlan
- wmi
(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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% 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:
- M{hash of full file path}
- 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\{string 1}{string 2}
ImagePath = %System%\{string 1}{string 2}.exe
where {string 1} and {string 2} is the same name as the drop file
It adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{string 1}{string 2} = "%AppDataLocal%\Microsoft\Windows\{string 1}{string 2}.exe
Information Theft
This Trojan Spy gathers the following data:
- Machine Name
- System Locale
- OS Version
- Running Processes
Other Details
This Trojan Spy connects to the following website to send and receive information:
- {BLOCKED}.{BLOCKED}.95.185:443
- {BLOCKED}.{BLOCKED}.252.178:8080
- {BLOCKED}.{BLOCKED}.159.58:443
- {BLOCKED}.{BLOCKED}.55.157:8080
- {BLOCKED}.{BLOCKED}.245.37:7080
- {BLOCKED}.{BLOCKED}.212.79.443
- {BLOCKED}.{BLOCKED}.192.45:8080
- {BLOCKED}.{BLOCKED}.131.20:8080
- {BLOCKED}.{BLOCKED}.252.178:8080
It does the following:
- It creates a startup service if it has admin privileges, otherwise it will only create an autorun entry in the registry.
- The infected machine serves as a botnet that sends spam email to spread the malware.
The following information is gathered from the C&C Server:
- message template
- list of recipients
- list of stolen credentials
- The spammed email may contain the following information:
Greetings {RCPT.NAME},
We were not able to reach you. Please reply with the status of this invoice as soon as possible. http://{BLOCKED}y.us/Invoice-number-77467611-Notification/
Many Thanks,
{FRIEND.NAME}
{FRIEND.EMAIL}
It deletes the initially executed copy of itself
SOLUTION
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, and then delete this registry key
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services
- {string 1}{string 2}
- {string 1}{string 2}
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.
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {string 1}{string 2} = "%AppDataLocal%\Microsoft\Windows\{string 1}{string 2}.exe
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_EMOTET.AUSJLA. 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.
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