Malicious RTF — malware analysis report

Static analysis result for SHA-256 ad841094aa8ad744…

MALICIOUS

RTF

10.5 KB
MD5: 628fcb7fe29df6ee64286915015c3496 SHA-1: 2c6fe87e62dce22c15439ba8b616b9fbb661c308 SHA-256: ad841094aa8ad7449dd081b08e4ebbae9b92d8c78f9f0de205be8da172f2adc0
120 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 (RTF_EQUATION_EDITOR). The ".objupdate" directive indicates that the embedded object will be activated automatically upon opening the document. This technique is commonly used to download and execute a secondary payload, leading to a full system compromise.

Heuristics 3

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000104e.bin
34e73d18170ae76ff58e28308f43f184363c87b059c8d7f8e00645b6ca33f0d4		 rtf-objdata-decoded RTF \objdata at offset 0x104E 2031 bytes

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