Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e5ed05fae6716045…

MALICIOUS

RTF / .DOC

224.4 KB First seen: 2024-12-03
MD5: e2a9bac75b39d8b56f2783811b184b01 SHA-1: cd5228bc4430e6dfb079679f29f33fcdec71de2f SHA-256: e5ed05fae6716045eb20fd21807974e9bd454116cc0d4fea1bcba4ba8428ec5a
180 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The presence of `RTF_OBJDATA`, `RTF_OBJEMB`, `CVE_2017_11882_EQUATION_OLE10NATIVE`, `RTF_OBJUPDATE`, and `RTF_OLE10NATIVE_STREAM` heuristics strongly indicates this exploit. The embedded object's decoded data has high entropy, suggesting it is likely a packed or encrypted payload. The document body is heavily obfuscated and does not provide clear user-facing content, further supporting a malicious intent via exploit.

Heuristics 5

  • Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
  • 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.
  • \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_off00001dba.bin
a60bce8e87defc6965bb715baf0deeb4860495b6cb547c110d7c91c805bc8a18		 rtf-objdata-decoded RTF \objdata at offset 0x1DBA 3656 bytes

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