Malicious RTF — malware analysis report

Static analysis result for SHA-256 46a2c2b2231be2d7…

MALICIOUS

RTF

8.2 KB First seen: 2021-09-29
MD5: f5c2594c363a6c4354052e5f8ab2b7b6 SHA-1: e2a1769f055c43ee0b3ba2116687e51fd266df23 SHA-256: 46a2c2b2231be2d78fc3be29c0473c87177811c38641fb815899789c62bc8592
120 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive forces the activation of this object, leading to the execution of arbitrary code. This is a common technique for delivering secondary payloads, such as malware downloaders.

Heuristics 3

  • 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
  • \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_off00000032.bin rtf-objdata-decoded RTF \objdata at offset 0x32 4157 bytes
SHA-256: 7aabeb365b524fe3b9619539884962cf1b23778d8a48e8e96d9904b5e95ccbd3

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