Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a2f34d41dae7d24e…

MALICIOUS

RTF / .DOC

2.21 MB
MD5: 1003a3560932316f965eceb34ec38488 SHA-1: ff874bf58b3d4e6563803c4c5353be46c937bb8d SHA-256: a2f34d41dae7d24e7a1e6c67b720266f3562fa588f9425bfd9d97db75fa69dac
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability related to Equation Editor. This exploit allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of `Equation.3` as a ProgID strongly indicates the exploitation of this known vulnerability.

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
bd31775b93e27d98730fe0f842be8dd91e0d0f62f50b278cad44711625cdc21b		 rtf-objdata-decoded RTF \objdata at offset 0x1116 26857 bytes
objdata_01_off0001c6a7.bin
fe43efbadd674765243cb2580d9955cd54bcbea3b2eb0d6d648fe532cb7ef883		 rtf-objdata-decoded RTF \objdata at offset 0x1C6A7 476202 bytes

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