78 lines
3.4 KiB
Text
78 lines
3.4 KiB
Text
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import "pe"
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rule turla_png_dropper {
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meta:
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author = "Ben Humphrey"
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description = "Detects the PNG Dropper used by the Turla group"
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reference = "https://www.nccgroup.trust/uk/about-us/newsroom-and-events/blogs/2018/november/turla-png-dropper-is-back/"
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date = "2018/11/23"
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hash1 = "6ed939f59476fd31dc4d99e96136e928fbd88aec0d9c59846092c0e93a3c0e27"
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id = "459f17c8-0eae-5736-8c7c-286625dc158f"
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strings:
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$api0 = "GdiplusStartup"
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$api1 = "GdipAlloc"
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$api2 = "GdipCreateBitmapFromStreamICM"
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$api3 = "GdipBitmapLockBits"
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$api4 = "GdipGetImageWidth"
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$api5 = "GdipGetImageHeight"
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$api6 = "GdiplusShutdown"
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$code32 = {
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8B 46 3C // mov eax, [esi+3Ch]
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B9 0B 01 00 00 // mov ecx, 10Bh
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66 39 4C 30 18 // cmp [eax+esi+18h], cx
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8B 44 30 28 // mov eax, [eax+esi+28h]
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6A 00 // push 0
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B9 AF BE AD DE // mov ecx, 0DEADBEAFh
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51 // push ecx
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51 // push ecx
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03 C6 // add eax, esi
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56 // push esi
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FF D0 // call eax
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}
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$code64 = {
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48 63 43 3C // movsxd rax, dword ptr [rbx+3Ch]
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B9 0B 01 00 00 // mov ecx, 10Bh
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BA AF BE AD DE // mov edx, 0DEADBEAFh
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66 39 4C 18 18 // cmp [rax+rbx+18h], cx
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8B 44 18 28 // mov eax, [rax+rbx+28h]
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45 33 C9 // xor r9d, r9d
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44 8B C2 // mov r8d, edx
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48 8B CB // mov rcx, rbx
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48 03 C3 // add rax, rbx
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FF D0 // call rax
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}
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550) and
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all of ($api*) and
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1 of ($code*)
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}
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rule turla_png_reg_enum_payload {
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meta:
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author = "Ben Humphrey"
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description = "Payload that has most recently been dropped by the Turla PNG Dropper"
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reference = "https://www.nccgroup.trust/uk/about-us/newsroom-and-events/blogs/2018/november/turla-png-dropper-is-back/"
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date = "2018/11/23"
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hash1 = "fea27eb2e939e930c8617dcf64366d1649988f30555f6ee9cd09fe54e4bc22b3"
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id = "413bb315-3c01-56ab-92db-00342a11438a"
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strings:
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$crypt00 = "Microsoft Software Key Storage Provider" wide
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$crypt01 = "ChainingModeCBC" wide
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/* $crypt02 = "AES" wide */ /* disabled due to performance reasons */
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550) and
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pe.imports("advapi32.dll", "StartServiceCtrlDispatcherA") and
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pe.imports("advapi32.dll", "RegEnumValueA") and
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pe.imports("advapi32.dll", "RegEnumKeyExA") and
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pe.imports("ncrypt.dll", "NCryptOpenStorageProvider") and
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pe.imports("ncrypt.dll", "NCryptEnumKeys") and
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pe.imports("ncrypt.dll", "NCryptOpenKey") and
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pe.imports("ncrypt.dll", "NCryptDecrypt") and
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pe.imports("ncrypt.dll", "BCryptGenerateSymmetricKey") and
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pe.imports("ncrypt.dll", "BCryptGetProperty") and
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pe.imports("ncrypt.dll", "BCryptDecrypt") and
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pe.imports("ncrypt.dll", "BCryptEncrypt") and
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all of them
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}
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