Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 5e207680ae296214…

MALICIOUS

RTF / .DOC

9.0 KB
MD5: cfff8fc5d2b16245e8d6cef893196cce SHA-1: 353d748346f3a59a8d3a20056e9c01261a69243d SHA-256: 5e207680ae2962144f51bb95400b8e704731e9f1383529d2b0f4f5db33163b3d
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 embedded OLE object data, specifically related to Microsoft Equation Editor. Heuristics indicate the exploitation of CVE-2017-11882, which allows for arbitrary code execution. The presence of `eQuAtioN.3` as a ProgID strongly suggests this exploit. The document likely serves as a spearphishing attachment designed to exploit this vulnerability.

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.
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001251.bin
b1d4717737745ca471e35a185241abaa716acee082b9bec822b09e712e103923		 rtf-objdata-decoded RTF \objdata at offset 0x1251 1458 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.