TROJ_PIRRIL.AG
Trojan:Win32/Trafog!rts (Microsoft), Backdoor.Win32.Ripinip.hw (Kaspersky), W32/Ripinip.A.gen!Eldorado (FProt)
Windows 2000, XP, Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: No
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
90,112 bytes
DLL
No
17 Feb 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 registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:
HKEY_CLASSES_ROOT\CLSID\{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}
HKEY_CLASSES_ROOT\PWFlash.PowerFlash
HKEY_CLASSES_ROOT\PWFlash.PowerFlash.1
It adds the following registry entries to install itself as a Browser Helper Object (BHO):
HKEY_CLASSES_ROOT\CLSID\{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}
(Default) = "PowerFlash Class"
HKEY_CLASSES_ROOT\CLSID\{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}\
InprocServer32
ThreadingModel = "Apartment"
HKEY_CLASSES_ROOT\CLSID\{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}\
ProgID
(Default) = "PWFlash.PowerFlash.1"
HKEY_CLASSES_ROOT\CLSID\{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}\
VersionIndependentProgID
(Default) = "PWFlash.PowerFlash"
HKEY_CLASSES_ROOT\PWFlash.PowerFlash
(Default) = "PowerFlash Class"
HKEY_CLASSES_ROOT\PWFlash.PowerFlash.1
(Default) = "PowerFlash Class"
HKEY_CLASSES_ROOT\PWFlash.PowerFlash.1\CLSID
(Default) = "{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}"
HKEY_CLASSES_ROOT\PWFlash.PowerFlash\CurVer
(Default) = "PWFlash.PowerFlash.1"
SOLUTION
8.900
7.842.04
17 Feb 2011
7.843.00
18 Feb 2011
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
Close all opened browser windows
Step 3
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_CLASSES_ROOT\CLSID
- {DC888631-57F5-4AF4-86B3-BDE5F854DCBF}
- {DC888631-57F5-4AF4-86B3-BDE5F854DCBF}
- In HKEY_CLASSES_ROOT
- PWFlash.PowerFlash
- PWFlash.PowerFlash
- In HKEY_CLASSES_ROOT
- PWFlash.PowerFlash.1
- PWFlash.PowerFlash.1
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_PIRRIL.AG. 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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