Backdoor.Win32.SHADOWHAMMER.AA
Backdoor:Win32/ShadowHammer!dha(Microsoft); Trojan.ShadowHammer.A(Bitdefender)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
Arrival Details
This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Other Details
This Backdoor does the following:
- The malicious code that loads, decrypts, and executes the shellcode in the resource can be found in a function call just before the "ExitProcess API"
- The executed shell code does the following:
- It checks the MAC address of the computer and generates an MD5 hash of it then compares it to a list.
- if found on the list, the malware downloads from the URL https://{BLOCKED}tfix.com/logo2.jpg?{MD5hash}.
- if not found, the malware drops, %User Profile%\idx.ini
- It checks the MAC address of the computer and generates an MD5 hash of it then compares it to a list.
However, as of this writing, the said sites are inaccessible.
SOLUTION
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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
Search and delete these files
- %UserProfile%\idx.ini
Step 4
Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.SHADOWHAMMER.AA. 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 the following Trend Micro Support pages for more information:
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