Malicious RTF — malware analysis report

Static analysis result for SHA-256 d7f0069b1a48d2fe…

MALICIOUS

RTF

2.44 MB
MD5: 4205869fc7572c694aae7da1fe53f3af SHA-1: 39c2e341b6e4663e56743871b3751fc49ad1a939 SHA-256: d7f0069b1a48d2fe9827e6eaa290bdb83e6f1bbe2adfe27ed6d60bf9fb4bc01b
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 specifically identified as related to CVE-2017-11882. This exploit is known to facilitate arbitrary code execution, indicating the file's primary purpose is to leverage this vulnerability to deliver a secondary payload. The presence of large hex-encoded data blocks within the OLE object further supports the hiding of malicious content.

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 ~2560KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \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_off000000ae.bin
97e2432b24ffb5b94ca7e0d0b90dbe9586a35b11532314b3d4388f7b544e61d8		 rtf-objdata-decoded RTF \objdata at offset 0xAE 1024021 bytes

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