77 lines
3.2 KiB
Text
77 lines
3.2 KiB
Text
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rule wiper {
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meta:
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description = "Wiper malware deployed in late 2014 skywiper attacks"
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strings:
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// 760C35A80D758F032D02CF4DB12D3E55 @ 0x40124A
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$decryption_main_loop = {8bcbe8????????8a143e32d088143e463bf57cec5f}
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// 760C35A80D758F032D02CF4DB12D3E55 @ 0x40118d
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$context_init_loop1 = { 8b790c8b411033f78971088bf033f789710c8b710833c64b89411075e3 }
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// 760C35A80D758F032D02CF4DB12D3E55 @ 0x4011b4
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$context_init_loop2 = { 8b510c8b41100bf28971088bf00bf289710c8b71080bc64f89411075e3 }
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$MZ = "MZ"
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condition:
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$MZ at 0 and 2 of them
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}
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rule wiper_payload_dropper {
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meta:
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description = "Wiper implant"
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filename = "iissvr.exe"
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strings:
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$MZ = "MZ"
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// the following 3 are used to transfer html/wav/jpg data from the resource section (these include the resource name following the http data)
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$html={485454502F312E3120323030204F4B0D0A436F6E74656E742D4C656E6774683A2025640D0A436F6E74656E742D547970653A20746578742F68746D6C0D0A4163636570742D52616E6765733A2062797465730D0A5365727665723A204D6963726F736F66742D4949532F362E300D0A0D0A000000525352435F48544D4C00}
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$wav={485454502F312E3120323030204F4B0D0A436F6E74656E742D4C656E6774683A2025640D0A436F6E74656E742D547970653A20696D6167652F6A7065670D0A4163636570742D52616E6765733A2062797465730D0A5365727665723A204D6963726F736F66742D4949532F362E300D0A0D0A0000525352435F4A504700}
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$jpg={485454502F312E3120323030204F4B0D0A436F6E74656E742D4C656E6774683A2025640D0A436F6E74656E742D547970653A20617564696F2F7761760D0A4163636570742D52616E6765733A2062797465730D0A5365727665723A204D6963726F736F66742D4949532F362E300D0A0D0A000000525352435F57415600}
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condition:
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$MZ at 0 and ($html or $wav or $jpg)
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}
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/*
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// Moderate confidence that this rule matches a legitimate driver component used by the wiper malware
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// as opposed to it having been signed by a stolen certificate.
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// It's commented out here because it could hit on legitimate software and the userland component
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// will be detected by signatures anyway.
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rule wiper_driver_component {
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meta:
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description = "Wiper implant"
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filename = "usbdrv3.sys"
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strings:
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$MZ = "MZ"
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// 86E212B7FC20FC406C692400294073FF @ 0x15F55
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$switch_table1 = {4C89B424C8000000488B4F088B414883F802742D83F807742883F81F742383F824741E83F82D741983F831741483F836740F83F830740ABB240000C0E9}
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// @ 0x164D8
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$switch_table2 = {488BF08B484883F903741D83F908741883F909741383F914740E83F920740983F9350F}
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condition:
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$MZ at 0 and $switch_table1 and $switch_table2
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}
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*/
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rule wiper_payload_dropper2 {
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meta:
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description = "Wiper implant"
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filename = "ams.exe"
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strings:
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$MZ = "MZ"
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// 7E5FEE143FB44FDB0D24A1D32B2BD4BB
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$process_hacker_ascii = {5c4465766963655c4b50726f636573734861636b657232}
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$process_hacker_unicode = {5c004400650076006900630065005c004b00500072006f0063006500730073004800610063006b006500720032000000}
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$mcshield_string = {53595354454d5c43757272656e74436f6e74726f6c5365745c73657276696365735c4d63536869656c6400}
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condition:
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$MZ at 0 and ($process_hacker_ascii or $process_hacker_unicode) and $mcshield_string
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}
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