Malicious RTF — malware analysis report

Static analysis result for SHA-256 7382f8b6cb4bd9f7…

MALICIOUS

RTF

977.3 KB Created: 2018-03-31 16:49:00 First seen: 2018-04-23
MD5: 835b6d5d8e3195308479a927dea3e1bd SHA-1: 4e3344ed915aa9f50086f3a07f5e0ae3581dbb77 SHA-256: 7382f8b6cb4bd9f7bc4971a72548773e9550fd212f3936b4d733feed403cc752
262 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects and triggers an ".objupdate" command, which is indicative of exploiting vulnerabilities like CVE-2017-8759 for client execution. ClamAV detections further confirm its malicious nature, flagging it as Doc.Macro.Obfuscation. The primary attack vector is likely spearphishing attachment, with the embedded OLE object serving as the mechanism to download and execute a secondary payload.

Heuristics 6

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • ClamAV: Doc.Macro.Obfuscation-6391394-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6391394-0
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 12 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c4c.bin rtf-objdata-decoded RTF \objdata at offset 0x2C4C 27707 bytes
SHA-256: fb6d6854a13d50d65076bd3e8f59401f0557331342d3b3d765ccd365bccbbd6f
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_01_off00016483.bin rtf-objdata-decoded RTF \objdata at offset 0x16483 27707 bytes
SHA-256: bfedf417739cb1270e0dca652e6eacf4abc04b4dc041cb13d942093293ef8557
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_02_off00029cba.bin rtf-objdata-decoded RTF \objdata at offset 0x29CBA 27707 bytes
SHA-256: d9a97d6242296b1564c8f86a423d0d322b249d939712755cbfd53060043ea821
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_03_off0003d4f1.bin rtf-objdata-decoded RTF \objdata at offset 0x3D4F1 27707 bytes
SHA-256: 578235a4a7c52ccd484ef73549cf720f3819c011480f87c1e75e2f0ec8c4600f
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_04_off00050d28.bin rtf-objdata-decoded RTF \objdata at offset 0x50D28 27707 bytes
SHA-256: d38f9c19c0b9531a48621bbaf38ca6335c9f4ed025d28c1fdc6d101a0ad7e850
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_05_off0006455f.bin rtf-objdata-decoded RTF \objdata at offset 0x6455F 27707 bytes
SHA-256: bb733688a210aaf34c80c0e30f4959f98139c16441f542fc5fa21ed764c0df8a
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_06_off00077d96.bin rtf-objdata-decoded RTF \objdata at offset 0x77D96 27707 bytes
SHA-256: 03a6b74e5767974d76910c9493c9ea1f697d9f18df8a764401b722fd3cdddcf1
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_07_off0008b5cd.bin rtf-objdata-decoded RTF \objdata at offset 0x8B5CD 27707 bytes
SHA-256: a25649a623e123f4980de9d90aaa39025fecaea29a6bc7eeb9ed50093a728459
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_08_off0009ee04.bin rtf-objdata-decoded RTF \objdata at offset 0x9EE04 27707 bytes
SHA-256: 1e72db859dc10f46f3b09f517e78bfe47b0817436997cee6e31da9b44c405932
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_09_off000b263b.bin rtf-objdata-decoded RTF \objdata at offset 0xB263B 27707 bytes
SHA-256: 3866d46533d75b9980a49e5f8a6a8fd060adf3d8e7f7b3fe05de93f787775d58
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_10_off000c5e72.bin rtf-objdata-decoded RTF \objdata at offset 0xC5E72 27707 bytes
SHA-256: c11bbd400efab5337b8ab77b3f02ee148bf04bfd32736b0515dcafed7ec91400
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_11_off000d96a9.bin rtf-objdata-decoded RTF \objdata at offset 0xD96A9 27707 bytes
SHA-256: 4a2d65ae2fb8acf7d70ae5643182f4923cdf0962ec6c0d23d5399a1e529cb28c
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely

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