Malicious RTF — malware analysis report

Static analysis result for SHA-256 4613536515233f35…

MALICIOUS

RTF

21.5 KB First seen: 2022-10-03
MD5: f6c27e9a03dbc20c110ede129ac5217b SHA-1: 8af21aeb0fa163bdf003899cc24f41b7115ce719 SHA-256: 4613536515233f35d3ee6f1975e3ede5f81b6ab86b5d84bab349e4bd1a136917
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The RTF file contains an embedded OLE object with an Equation Editor CLSID, indicating exploitation of CVE-2017-11882. The \objupdate directive forces activation of this object, which is designed to execute arbitrary code. The embedded object data, objdata_00_off000013eb.bin, is the likely stage-one payload, which would then download and execute a secondary payload.

Heuristics 4

  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • Equation Editor CLSID critical 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000013eb.bin
643714a6a512e87c7ebede8c5819fbfee0d99bf0fb11daac2ec9c3352ad05deb		 rtf-objdata-decoded RTF \objdata at offset 0x13EB 4690 bytes

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