Malicious RTF — malware analysis report

Static analysis result for SHA-256 b4382e8e0b9524ed…

MALICIOUS

RTF

13.1 KB
MD5: 5dd959549672b84b8fe17d62683f96ec SHA-1: 7feb1e95b903aeac6a69fb68f6bd4d04afceee0e SHA-256: b4382e8e0b9524ed69dd0365812c78e51eb5d967931d26ddd5d80e012d9edf29
140 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive forces the OLE object to activate, triggering the exploit. This is a common delivery mechanism for malware that aims to download and execute a second-stage payload.

Heuristics 4

  • 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.
  • 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_off00001948.bin
147c589f6d8af98bcf771474b57e5887ca3eaf36fe5ee12b5819c7439e49cf37		 rtf-objdata-decoded RTF \objdata at offset 0x1948 2149 bytes

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