23 lines
1,005 B
Text
23 lines
1,005 B
Text
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rule MAL_RANSOM_REvil_Oct20_1 {
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meta:
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description = "Detects REvil ransomware"
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author = "Florian Roth (Nextron Systems)"
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reference = "Internal Research"
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date = "2020-10-13"
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hash1 = "5966c25dc1abcec9d8603b97919db57aac019e5358ee413957927d3c1790b7f4"
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hash2 = "f66027faea8c9e0ff29a31641e186cbed7073b52b43933ba36d61e8f6bce1ab5"
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hash3 = "f6857748c050655fb3c2192b52a3b0915f3f3708cd0a59bbf641d7dd722a804d"
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hash4 = "fc26288df74aa8046b4761f8478c52819e0fca478c1ab674da7e1d24e1cfa501"
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id = "0c85a2cc-3487-577f-bd12-e3effd8fc811"
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strings:
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$op1 = { 0f 8c 74 ff ff ff 33 c0 5f 5e 5b 8b e5 5d c3 8b }
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$op2 = { 8d 85 68 ff ff ff 50 e8 2a fe ff ff 8d 85 68 ff }
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$op3 = { 89 4d f4 8b 4e 0c 33 4e 34 33 4e 5c 33 8e 84 }
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$op4 = { 8d 85 68 ff ff ff 50 e8 05 06 00 00 8d 85 68 ff }
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$op5 = { 8d 85 68 ff ff ff 56 57 ff 75 0c 50 e8 2f }
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condition:
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uint16(0) == 0x5a4d and
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filesize < 400KB and
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2 of them or 4 of them
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}
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