Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 2e60c0b9ac427df1…

MALICIOUS

RTF / .DOC

1.65 MB First seen: 2022-05-12
MD5: 378cd1d3b3ffd67fafa3acc07b262467 SHA-1: 81f4a4fed96a43cbb4b6a4ba917485dcdb299990 SHA-256: 2e60c0b9ac427df11f51daeb5f5bb4d1dd03706e44c342f4c4ad39357ee57056
240 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File T1059 Command and Scripting Interpreter

The RTF file contains OLE object data and is related to CVE-2017-11882, indicating an exploit attempt. The critical heuristics 'RTF_EQUATION_EDITOR' and 'CVE_2017_11882_RELATED' strongly suggest the use of this known vulnerability to deliver a payload. The presence of large hex data blocks within OLE objects further supports the hiding of a malicious executable. The attack pattern involves exploiting this vulnerability to execute arbitrary code, likely leading to a second-stage download.

Heuristics 6

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1722KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001e92.bin
fcbf46c99958610023e0c2fbea6ddb344a3d39a8f1d858a77880f2425e3dbb2d		 rtf-objdata-decoded RTF \objdata at offset 0x1E92 861432 bytes

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