Malicious RTF — malware analysis report

Static analysis result for SHA-256 99ee5b26aac4dae4…

MALICIOUS

RTF

48.8 KB First seen: 2019-01-12
MD5: 78572edf85cd77501be19b00006b9eb9 SHA-1: df22681a986685874d4f4a0cbce0080f770c10ea SHA-256: 99ee5b26aac4dae4a4864bb10294e37d99c9127036043d6c14a5f0370d56a1be
180 Risk Score

Malware Insights

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

The sample is an RTF document that contains OLE object data and triggers the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution, which is typically used to download and execute a second-stage malware. The ClamAV detection name further confirms the exploit. No document body or script content was available for further analysis.

Heuristics 4

  • 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: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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_off00001329.bin rtf-objdata-decoded RTF \objdata at offset 0x1329 4939 bytes
SHA-256: d8c5d4f06736b20ac2557c0692c5c0bb4eac97f338d1013a425553338f8cf003

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