Malicious RTF — malware analysis report

Static analysis result for SHA-256 dbcc4fe10cbbedab…

MALICIOUS

RTF

1.10 MB
MD5: 9307acf19060a845373d6aeba53c7709 SHA-1: a1bd6ea561c20c38b6acd017a208fa560d027941 SHA-256: dbcc4fe10cbbedab8cea74c2be3956e9ae3bfd7f180c8abe5ec62ab7675f5ddd
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects, specifically identified as related to Equation Editor and CVE-2017-11882. The presence of RTF_OBJUPDATE indicates that the embedded object is forced to activate, leading to the exploitation of the CVE-2017-11882 vulnerability for client execution. No specific malware family could be identified from the available evidence.

Heuristics 5

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger 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.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000011e1.bin
342bb48e7f7f6261b7730105fdd0f286ad2d582d014d75a23cfa6d445c850dd3		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 35461 bytes
objdata_01_off00021c21.bin
a6f253d6bbd0460ac77e10ef1bc8f05800fa5562b3652b8ea10ed15d9e3c5eda		 rtf-objdata-decoded RTF \objdata at offset 0x21C21 246442 bytes

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