Malicious RTF — malware analysis report

Static analysis result for SHA-256 f37d72d467517e18…

MALICIOUS

RTF

911.4 KB Created: 2019-10-04 10:31:00 First seen: 2021-09-27
MD5: e278a3d61d7f534756200e4390473daa SHA-1: b8020d4ad1eeaaa8020323d1056bd85a0e688e5d SHA-256: f37d72d467517e18d0b3620281a419e6c8276a67d6ff62d7a8454e7650592ea8
142 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects, with a critical heuristic indicating exploitation of CVE-2017-8759. This vulnerability allows for the activation of these objects, which is likely used to download and execute a secondary payload. The presence of multiple OLE objects suggests a robust attempt to deliver a malicious payload, warranting a high confidence in the exploitation technique.

Heuristics 5

  • 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.
  • \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 9 \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 http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000029ab.bin rtf-objdata-decoded RTF \objdata at offset 0x29AB 37947 bytes
SHA-256: ed37ff0336ddc2ff4a6283eea44d699742eb4b14ea5531c0bd5e313c7d12445f
objdata_01_off0001ac0c.bin rtf-objdata-decoded RTF \objdata at offset 0x1AC0C 37947 bytes
SHA-256: d15c9b3e5cb56ac3d72b44a12ff80f706889800cb46383d140af5909fd4dce46
objdata_02_off00032f74.bin rtf-objdata-decoded RTF \objdata at offset 0x32F74 37947 bytes
SHA-256: b852950fdbfdbc3ced65025c1da0bb119442b1e51c1a46caeca9573bf0898516
objdata_03_off0004b2dc.bin rtf-objdata-decoded RTF \objdata at offset 0x4B2DC 37947 bytes
SHA-256: cae301a9edbacc849a6ad1a5a7611c651492c658fabe8008740fe5c336e1db20
objdata_04_off00063644.bin rtf-objdata-decoded RTF \objdata at offset 0x63644 37947 bytes
SHA-256: ccd07849012f0fd26da05891c2d2989b4ccf4a4ed120e55803a86ebf4fa5a4a1
objdata_05_off0007b9ac.bin rtf-objdata-decoded RTF \objdata at offset 0x7B9AC 37947 bytes
SHA-256: b747b40902f12b773eb50030214210991c75806d86c76cae463d364cedd4e75c
objdata_06_off00093d14.bin rtf-objdata-decoded RTF \objdata at offset 0x93D14 37947 bytes
SHA-256: 8a7c0b181d39dc52b3cc22988e64d01fce807046947f27f19ad0c6ce80ba4918
objdata_07_off000ac07c.bin rtf-objdata-decoded RTF \objdata at offset 0xAC07C 37947 bytes
SHA-256: 274cccde01bbef6f00143ca85e49c0008d2db615daa2f02cba6f91089e932191
objdata_08_off000c43e4.bin rtf-objdata-decoded RTF \objdata at offset 0xC43E4 37947 bytes
SHA-256: f72e1abb4a59c338cfeefb7e992adb3660e75f014cdac459794cb23c54466fb5

Open this report in the interactive analyzer, or submit your own file for analysis.