TROJ_RANSOM.TDV
Trojan:Win32/Ransom.DU (Microsoft); PWS-Zbot.gen.hb (McAfee); Trojan.Gen (Symantec); Trojan-Dropper.Win32.Dapato.mza (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.KD.399442 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
187,904 bytes
EXE
Yes
19 Nov 2011
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.
Autostart Technique
This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "%User Profile%\Application Data\mahmud.exe"
(Note: The default value data of the said registry entry is Explorer.exe.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}2y.com/check?a=2
It deletes the initially executed copy of itself
This report is generated via an automated analysis system.
SOLUTION
9.200
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Identify and delete files detected as TROJ_RANSOM.TDV using either the Startup Disk or Recovery Console
Step 3
Restore this modified 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Shell="%User Profile%\Application Data\mahmud.exe"
To: Shell=Explorer.exe
- From: Shell="%User Profile%\Application Data\mahmud.exe"
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_RANSOM.TDV. 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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