Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 153faf944590ffc1…

MALICIOUS

RTF / .DOC

2.21 MB
MD5: 5626f64c57491d2f2d614c47da4b9063 SHA-1: 1a248103d388028fce134bb9cf3f8051b56f6b50 SHA-256: 153faf944590ffc174faee0c67b6f4a47f186d016881ce3441542f7a36ab8b82
180 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that triggers CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This exploit is used to execute arbitrary code, likely to download and run a secondary payload. The presence of the Equation Editor ProgID 'Equation.3' is a strong indicator of this exploit.

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_off00001116.bin
5721cf69dce430e6d63a4c1ceb591f4cecee8d879ea794a029605c0124062e59		 rtf-objdata-decoded RTF \objdata at offset 0x1116 26823 bytes
objdata_01_off0001c663.bin
fe43efbadd674765243cb2580d9955cd54bcbea3b2eb0d6d648fe532cb7ef883		 rtf-objdata-decoded RTF \objdata at offset 0x1C663 476202 bytes

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