Malicious RTF — malware analysis report

Static analysis result for SHA-256 2ff2ae2258219e80…

MALICIOUS

RTF

9.2 KB First seen: 2019-01-12
MD5: 3717f791fb35b7573778470a5cf56b43 SHA-1: eb44e5b1c4214aecf7c8b74c7bac6dcf338cc352 SHA-256: 2ff2ae2258219e80d1dbdd67ad03b4943429c079fc561ec5faee996405475748
200 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object, specifically triggering the Equation Editor vulnerability (CVE-2017-11882). This exploit allows for arbitrary code execution upon opening the document. The ClamAV detection name directly confirms the exploitation of this known vulnerability.

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
  • 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
  • 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_off0000003b.bin rtf-objdata-decoded RTF \objdata at offset 0x3B 4671 bytes
SHA-256: eaff07eb17a4f470bfd6d4eb85844ab1b08cb4147b5e90d7d2d7e0dd5b7744c5

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