Malicious RTF — malware analysis report

Static analysis result for SHA-256 7cd086be8552ffff…

MALICIOUS

RTF

11.9 KB First seen: 2020-02-04
MD5: ac8ce83ca278f6020f7b67806dd93f95 SHA-1: 7c327f870c79667277b53402739bf630cde2ae82 SHA-256: 7cd086be8552ffff07b67cbf7e48213e9813a648313448de34caba5006796cd8
240 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that exploits the Equation Editor vulnerability CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of the Ole10Native stream and the specific CLSID strongly indicate this exploit.

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
  • Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
  • 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.
  • \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_off00000960.bin rtf-objdata-decoded RTF \objdata at offset 0x960 4662 bytes
SHA-256: dc967a578edb25361c23fa2ee0e71523dd34428bd0e1269363141c61e209ac36

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