Malicious RTF — malware analysis report

Static analysis result for SHA-256 bae556776339d714…

MALICIOUS

RTF

529.1 KB First seen: 2021-10-04
MD5: 1e984bbf1ed2ef9bfbffe0f7f0f172b7 SHA-1: 915fc9fc965af08c33f53e5ee757a4a5ccaf19e0 SHA-256: bae556776339d714b2619811c772e7be0fa8921929afce61590039d79e719bc5
240 Risk Score

Malware Insights

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

This RTF document was flagged as malicious. It uses an "enable content/editing" lure. Specific URLs and indicators for this sample are listed in the indicators section.

Heuristics 7

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000095d.bin rtf-objdata-decoded RTF \objdata at offset 0x95D 171538 bytes
SHA-256: 5446b132dd2c8ae346b3f6e54d196deda0018367c7bcd42c75df49ca99eb477f
objdata_01_off000560fa.bin rtf-objdata-decoded RTF \objdata at offset 0x560FA 2632 bytes
SHA-256: 9d9bc825f2fa5e0ed8db7dce6823e199ad9c775873472d42887214589f205470
objdata_02_off00057695.bin rtf-objdata-decoded RTF \objdata at offset 0x57695 12297 bytes
SHA-256: 44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037

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