Malicious RTF — malware analysis report

Static analysis result for SHA-256 ef1f599442fc4224…

MALICIOUS

RTF

327.9 KB Created: 2021-10-04 10:09:00 First seen: 2021-10-14
MD5: dd8bb1686f16924ac797620092776022 SHA-1: 1cf5793c05fcb2ade137f4914a04356561650a30 SHA-256: ef1f599442fc42245a87ee927eacc359552e99154134ed4c5964ac7c03884229
422 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects that exploit known vulnerabilities, specifically CVE-2017-11882 and CVE-2017-8759, related to the Equation Editor. These exploits are designed to execute arbitrary code, likely downloading and running a second-stage payload from the provided URLs. The document body appears to be a job application or similar text, likely used as a lure.

Heuristics 10

  • 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.
  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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.
  • ClamAV: Rtf.Exploit.CVE_2018_0802-6624871-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6624871-1
  • 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
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gozdeelektronik.net/wp-content/themes/0111/movie.png In RTF body
    • https://gozdeelektronik.net/wp-content/themes/0111/movie.jpgIn RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00017333.bin rtf-objdata-decoded RTF \objdata at offset 0x17333 3314 bytes
SHA-256: 67d1d63fd90c84dd3f62bcd12421ba475a1ac952c80a75c1c107626be6219396
objdata_01_off0004d0ae.bin rtf-objdata-decoded RTF \objdata at offset 0x4D0AE 9747 bytes
SHA-256: 13f1c1bfe6296872b914943136b22ab0ec84a19118cb6ff3b9fb3649a763e2d8

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