Malicious RTF — malware analysis report

Static analysis result for SHA-256 e57238d440a1d24e…

MALICIOUS

RTF

463.6 KB Created: 2018-12-26 14:35:00 First seen: 2019-09-30
MD5: a1d8ce39c8649bfb583f7ba751dedb84 SHA-1: 0fb9364823f29d1c07d6f1d3a680da2b31486944 SHA-256: e57238d440a1d24e43964fd4bf81c8a7efe92dcd5bad90c44cf139dcd8aa985b
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.Dropper.Agent-6938873-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6938873-0
  • \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 7 \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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000294f.bin rtf-objdata-decoded RTF \objdata at offset 0x294F 19521 bytes
SHA-256: c66e658dd3a4fa6b9bbadf7d44c1f7f622717a11c4cb2d7dd14e7b8d4998dc4d
objdata_01_off00011b65.bin rtf-objdata-decoded RTF \objdata at offset 0x11B65 19521 bytes
SHA-256: 1689932136d67a82d448c51871ae29415b1b664737cf42b6c75d60dfbd53af51
objdata_02_off00020d7b.bin rtf-objdata-decoded RTF \objdata at offset 0x20D7B 19521 bytes
SHA-256: dd8431a073d7a8caad001ccd3bec5c8422f2ab62aae9412e04b64fae03a00421
objdata_03_off0002ff91.bin rtf-objdata-decoded RTF \objdata at offset 0x2FF91 19521 bytes
SHA-256: 9774b6217265d7db18f9e46c274bf4e31edebf1ec71c31e090baff58113e695c
Detection
ClamAV: Doc.Dropper.Agent-6938873-0
Obfuscation or payload: unlikely
objdata_04_off0003f1a7.bin rtf-objdata-decoded RTF \objdata at offset 0x3F1A7 19521 bytes
SHA-256: 90d1b47ebe2527184abd8a231cddd4840364b3b849192c0f3922b9650c380c6f
objdata_05_off0004e3bd.bin rtf-objdata-decoded RTF \objdata at offset 0x4E3BD 19521 bytes
SHA-256: 3654938e5713d188dd73aba74be29b5afbdebbb575163eeaa48e717611d90035
objdata_06_off0005d5d3.bin rtf-objdata-decoded RTF \objdata at offset 0x5D5D3 19521 bytes
SHA-256: 905fc324fe4e8d1de10383f26cb780d05e119a023d7ff975cab25ceaceab7ecb
Detection
ClamAV: Doc.Dropper.Agent-6947618-0
Obfuscation or payload: unlikely

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