Malicious RTF — malware analysis report

Static analysis result for SHA-256 a059b9eedc8f1d70…

MALICIOUS

RTF

14.5 KB First seen: 2023-05-18
MD5: f2a3a6c06d0057fba0e9cbf1bc63553b SHA-1: ae15b022de3611b72b78b2a42c93c5ebe506e63c SHA-256: a059b9eedc8f1d708c090f87c3d54821a82f642f6eb53f70b6f61c88cf854abc
300 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559 Component Object Model Hijacking T1059 Command and Scripting Interpreter

The RTF file contains an embedded OLE object specifically targeting the Equation Editor vulnerability (CVE-2017-11882). This exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The presence of the Equation Editor CLSID and Ole10Native stream strongly indicates exploitation of this known vulnerability.

Heuristics 7

  • 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.
  • 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
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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_off00001d2a.bin
a0aaf6271f5a0aef0547b3933eeb69cb82e5f00680afa6df14c62d7ac417c6bd		 rtf-objdata-decoded RTF \objdata at offset 0x1D2A 3660 bytes

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