Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 2e5eabee7001e4a5…

MALICIOUS

RTF / .DOC

1.19 MB Created: 2019-09-17 13:59:00
MD5: 3aaa0bd6ad9e231058ef998b9fb8e72c SHA-1: dce4339db16d08ab502093b87d5607243a0264e4 SHA-256: 2e5eabee7001e4a5adec24a18e680548ce354128edfdb10946fe4ee8a15b92cf
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-8759) to execute code. The presence of ` tf_objdata`, ` tf_objemb`, and ` tf_objupdate` heuristics further indicate the exploitation of OLE objects. The `SE_PASSWORD_ARCHIVE_LURE` heuristic suggests the document may be instructing the user to open a password-protected archive, a common social engineering tactic to bypass gateway security.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0012528b.bin
df867ba99e000d95a5cfbd77541700dc1fd85095905f83e956b7fa8311d0d3b0		 rtf-objdata-decoded RTF \objdata at offset 0x12528B 3739 bytes

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