Malicious RTF — malware analysis report

Static analysis result for SHA-256 a6d7d5163c3e2102…

MALICIOUS

RTF

83.1 KB First seen: 2019-11-20
MD5: 9f912de26babaca548c53f5adff9cea5 SHA-1: 98f236ab2e13397e0b516ff3ce58432c1b79d883 SHA-256: a6d7d5163c3e21024e7fb77344b94a8791e9558a9699e348e61d02cb4be989be
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that leverages a known vulnerability in the Equation Editor (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code when the object is activated, likely leading to the download and execution of a secondary payload. No document body text or scripts were extracted, limiting further analysis of the specific payload.

Heuristics 4

  • 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.
  • \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_off0000006c.bin rtf-objdata-decoded RTF \objdata at offset 0x6C 27921 bytes
SHA-256: cc000852e0f907fe920983f622adc181bb519f2e9aae7610acba301962bdea98

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