Rtf.Dropper.Agent-7611939-0 — RTF malware analysis

Static analysis result for SHA-256 c0530c62e88d56a5…

MALICIOUS

RTF

12.0 KB First seen: 2020-05-25
MD5: 48a5ae43ab1cdb82cd8a261723a76597 SHA-1: 7469393d6c322a91daf5bb32f4a6a3b1b25ba3d1 SHA-256: c0530c62e88d56a5d881538c23b3ff41655502dc0abab8b9d24cc92d35604c75
240 Risk Score

Malware Insights

Rtf.Dropper.Agent-7611939-0 · confidence 95%

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

The RTF file contains an embedded OLE object that exploits CVE-2017-11882 via a font record overflow in Microsoft Equation Editor. This vulnerability is used to execute arbitrary code, likely to download and run a secondary payload. The ClamAV signature Rtf.Dropper.Agent-7611939-0 further confirms its malicious dropper functionality.

Heuristics 5

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • ClamAV: Rtf.Dropper.Agent-7611939-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7611939-0
  • \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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000f5c.bin rtf-objdata-decoded RTF \objdata at offset 0xF5C 4149 bytes
SHA-256: 9204baa77f19498a46829ab0b5ad4bc021f21fd21c94533fd76c2defd8d7fbb9

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