Malicious RTF — malware analysis report

Static analysis result for SHA-256 1ac54e8c38c07efa…

MALICIOUS

RTF

8.3 KB First seen: 2020-04-06
MD5: 03dd9f3019550169a008b940b684fdea SHA-1: 93d8444b6e2ca5dba1236e13f06089aea262669c SHA-256: 1ac54e8c38c07efa41efdb8db3b520ee2fc76b1659bb48b1f66a996f6c59dda3
140 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and specifically triggers heuristics for Microsoft Equation Editor exploitation and OLE object activation. This strongly suggests the file is designed to exploit a known vulnerability in Equation Editor (CVE-2017-11882 or similar) to achieve arbitrary code execution. The embedded OLE object likely contains shellcode or a dropper for a secondary payload.

Heuristics 4

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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_off00000032.bin rtf-objdata-decoded RTF \objdata at offset 0x32 4145 bytes
SHA-256: 43d9657b26993983f7a6ead9e2fedcb2b46c26f68e134f40f22bf4e3c14b2363

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