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Posts Tagged ‘symbos’

It’s high time the Crypto Girl talks about Crypto, isn’t it? A few days ago, I analyzed a malicious Opera Updater, named SymbOS/OpFake.A!tr.dial, and was surprised to discover it uses a 91-byte XOR key to conceal one of its configuration file. 91 bytes?! Yes, bytes, so 728 bits. This is quite a lot. AES only […]

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Here’s the technical analysis related to yesterday’s post on Trojan:SymbOS/OpFake.A. OpFake.A arrives as a supposed Opera Mini updater using file names such as OperaUpdater.sisx and Update6.1.sisx. The malware installer adds an Opera icon to the application menu. When run, it will show a menu and a fake download progress bar. Progress bar displayed… even though […]

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