Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 11e9dff933cd3ab4…

MALICIOUS

RTF / .DOC

8.5 KB
MD5: a8f9589782201b809e723059e7c0ca15 SHA-1: f56ad8babbd8b3258983275fba37e4316adf5409 SHA-256: 11e9dff933cd3ab46bbfd45b0cc58ab1785c62a857c4fb8cdc0fcff2577b0759
220 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects and specifically triggers heuristics related to the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to allow for arbitrary code execution when exploited, typically delivered via spearphishing attachments. No specific malware family was identified, but the exploit is the primary indicator of malicious intent.

Heuristics 5

  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000009d.bin
f9f4715aefc80a1e2b1f93674d3c6eb5679c7399e37d6a7c079b29beb47e9ca6
rtf-objdata-decoded RTF \objdata at offset 0x9D 4147 bytes