TROJ_RENOS.SML
TrojanDownloader:Win32/Renos.EK (Microsoft); Downloader-BKM (McAfee); Trojan.FakeAV.B (Symantec); PAK:UPX, Trojan.Win32.FraudPack.gtv (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.1002686 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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.
TECHNICAL DETAILS
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.
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\
MSFox
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\
MSFox
Str5 = "x6tVEq8nGbTmPkNQIrNNQAuuDXWX"
HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\
MSFox
Str9 = "zbZdFr5/CbjyPkNQIrNNQAuuDXWXEvOyhwYIMvYIWoHwgiUTaU8JbxpO"
HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\
MSFox
Str6 = "gKFdEw=="
HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\
MSFox
Str7 = "ga9ZFK1vCPLtfEhWbqZFVA=="
HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\
MSFox
Str8 = "lg=="
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters
TrapPollTimeMilliSecs = "3a98"
(Note: The default value data of the said registry entry is 3a98.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}big-library.com/img/config.gif
- http://{BLOCKED}big-library.com/images/box01.gif
- http://{BLOCKED}gecatalogue.com/images/transpix.gif
- http://{BLOCKED}5.180.145/images/box04.gif
This report is generated via an automated analysis system.
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
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\SOFTWARE\Mozilla
- MSFox
Step 3
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_LOCAL_MACHINE\SOFTWARE\Mozilla\MSFox
- Str5 = "x6tVEq8nGbTmPkNQIrNNQAuuDXWX"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\MSFox
- Str9 = "zbZdFr5/CbjyPkNQIrNNQAuuDXWXEvOyhwYIMvYIWoHwgiUTaU8JbxpO"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\MSFox
- Str6 = "gKFdEw=="
- In HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\MSFox
- Str7 = "ga9ZFK1vCPLtfEhWbqZFVA=="
- In HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\MSFox
- Str8 = "lg=="
Step 4
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RFC1156Agent\CurrentVersion\Parameters
- From: TrapPollTimeMilliSecs = "3a98"
To: TrapPollTimeMilliSecs = ""3a98""
- From: TrapPollTimeMilliSecs = "3a98"
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_RENOS.SML. 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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