18 lines
689 B
Text
18 lines
689 B
Text
rule win_ostap_jse {
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meta:
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author = "Alex Holland @cryptogramfan (Bromium Labs)"
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reference = "https://threatresearch.ext.hp.com/deobfuscating-ostap-trickbots-javascript-downloader/"
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date = "2019-08-29"
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sample_1 = "F3E03E40F00EA10592F20D83E3C5E922A1CE6EA36FC326511C38F45B9C9B6586"
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sample_2 = "38E2B6F06C2375A955BEA0337F087625B4E6E49F6E4246B50ECB567158B3717B"
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strings:
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$comment = { 2A 2A 2F 3B } // Matches on **/;
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$array_0 = /\w{5,8}\[\d+\]=\d{1,3};/
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$array_1 = /\w{5,8}\[\d+\]=\d{1,3};/
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condition:
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((($comment at 0) and (#array_0 > 100) and (#array_1 > 100)) or
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((#array_0 > 100) and (#array_1 > 100))) and
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(filesize > 500KB and filesize < 1500KB)
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}
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