Malicious RTF — malware analysis report

Static analysis result for SHA-256 7192e274475d7556…

MALICIOUS

RTF

10.7 KB First seen: 2020-08-25
MD5: 2e26cdb457a9a300f09115c349043d81 SHA-1: 0906ff26e2695755a50b301a7b51411a8496469e SHA-256: 7192e274475d755647eb1dd39fa0ec6aa9b2421af1b928f7072e46c1b1cd7386
200 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that triggers CVE-2017-11882 via the Equation Editor. This exploit is known to download and execute a second-stage payload, indicating a malicious intent to compromise the user's system. The specific ProgID 'eQuAtiON.3' is a strong indicator of this exploit.

Heuristics 5

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • 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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001be3.bin rtf-objdata-decoded RTF \objdata at offset 0x1BE3 1651 bytes
SHA-256: 3a3bc8d161cb26cd3bac000fa500f50c78bbfc55b53763c2c4a043882199309e

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