Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a92a4a98df77db27…

MALICIOUS

RTF / .DOC

1.53 MB
MD5: a6e2fc1a8a800ea9daf1db79c6f6906e SHA-1: 5f465bbc2d000f5e5d4d65a0816bee3d12889cb7 SHA-256: a92a4a98df77db2701c43f53f5f7a9396356c46084250e8bc005beb35ee082fe
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object specifically related to CVE-2017-11882, indicating exploitation of this vulnerability for initial execution. The presence of excessive hex-encoded data within the OLE object suggests it is used to hide a malicious payload. No document body text or scripts were provided, but the critical heuristics strongly point to a known exploit delivery mechanism.

Heuristics 6

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1609KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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_off0000003d.bin
79f3d093e3aedc71f08cc3a795fe451bd62604dc22fdcd253216d395e6a19133		 rtf-objdata-decoded RTF \objdata at offset 0x3D 804569 bytes

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