Malicious RTF — malware analysis report

Static analysis result for SHA-256 11d4cfe9362ee70d…

MALICIOUS

RTF

296.6 KB Authoring application: Riched20 6.3.9600 First seen: 2019-05-31
MD5: 0c9c30a0f7ab0f732182f30b19dd3508 SHA-1: 3338716c4711abbe5820e5953cadfb412479dcf5 SHA-256: 11d4cfe9362ee70dfbb5e02758e5c4ee030e505f55ed732073d9e2c5a4cb849e
260 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document containing embedded OLE objects, specifically identified as exploiting the Equation Editor vulnerability (CVE-2017-11882). This exploit allows for arbitrary code execution upon opening the document, indicating a malicious intent to compromise the user's system.

Heuristics 6

  • 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: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • \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_off00004357.bin rtf-objdata-decoded RTF \objdata at offset 0x4357 45078 bytes
SHA-256: 5543cb85b0152e222276b22b2169b918d4df30402a49e3dc1343d9ba67da67df

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