86 lines
2.3 KiB
Text
86 lines
2.3 KiB
Text
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// rules specific to the winsec malware families
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import "pe"
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rule RomeoWhiskey_Two
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{
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meta:
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copyright = "2015 Novetta Solutions"
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author = "Novetta Threat Research & Interdiction Group - trig@novetta.com"
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Source = "a8d88714f0bc643e76163d1b8972565e78a159292d45a8218d0ad0754c8f561d"
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strings:
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/*
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FF 15 78 A2 00 10 call GetTickCount_9
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66 8B C8 mov cx, ax
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// the next op is a mov or a push/pop depending on the code version
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53 push ebx
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8F 45 F4 pop dword ptr [ebp-0Ch]
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//or
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89 5D F4 mov dword ptr [ebp+var_C], ebx
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66 81 F1 40 1C xor cx, 1C40h
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66 D1 E9 shr cx, 1
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81 C1 E0 56 00 00 add ecx, 56E0h
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0F B7 C9 movzx ecx, cx
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0F B7 C0 movzx eax, ax
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81 F1 30 32 00 00 xor ecx, 3230h
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C1 E0 10 shl eax, 10h
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0B C8 or ecx, eax
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*/
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$a = {
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FF 15 [4]
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66 8B C8
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[3-4]
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66 81 F1 40 1C
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66 D1 E9
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81 C1 E0 56 00 00
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0F B7 C9
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0F B7 C0
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81 F1 30 32 00 00
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C1 E0 10
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0B C8
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}
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condition:
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$a in ((pe.sections[pe.section_index(".text")].raw_data_offset)..(pe.sections[pe.section_index(".text")].raw_data_offset + pe.sections[pe.section_index(".text")].raw_data_size))
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}
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rule RomeoWhiskey_One
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{
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meta:
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copyright = "2015 Novetta Solutions"
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author = "Novetta Threat Research & Interdiction Group - trig@novetta.com"
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Source = "5d21e865d57e9798ac7c14a6ad09c4034d103f3ea993295dcdf8a208ea825ad7"
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strings:
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/*
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FF 15 D8 5B 00 10 call GetTickCount_9
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0F B7 C0 movzx eax, ax
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8B C8 mov ecx, eax
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// skipped: 6A 01 push 1 ; fDecode
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C1 E9 34 shr ecx, 34h <--- this value could change
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81 F1 C0 F3 00 00 xor ecx, 0F3C0h <--- this value could change
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// skipped: 6A 04 push 4 ; dwLength
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C1 E0 10 shl eax, 10h
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0B C8 or ecx, eax
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*/
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$a = {
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FF 15 [4]
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0F B7 C0
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8B C8
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[2-4]
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C1 E9 ??
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81 F1 [2] 00 00
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[0-2]
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C1 E0 10
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0B C8
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}
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condition:
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$a in ((pe.sections[pe.section_index(".text")].raw_data_offset)..(pe.sections[pe.section_index(".text")].raw_data_offset + pe.sections[pe.section_index(".text")].raw_data_size))
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}
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