Malicious RTF — malware analysis report

Static analysis result for SHA-256 0aefa035cbddd2f1…

MALICIOUS

RTF

841.4 KB Created: 2018-03-12 22:10:00 First seen: 2018-05-18
MD5: c0528af613e3d8c08324a796b3b10ee7 SHA-1: 4653ce8d46a438aaa45226972dfd9721afa7dee6 SHA-256: 0aefa035cbddd2f1adbd14dbcf9648b3da45c079d70c078569f7ee7cc4c7ba97
262 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects and triggers an ".objupdate" command, which is indicative of exploiting vulnerabilities like CVE-2017-8759 for client execution. ClamAV detections further confirm its malicious nature, flagging it as Doc.Macro.Obfuscation. The primary attack vector is likely spearphishing attachment, with the embedded OLE object serving as the mechanism to download and execute a secondary payload.

Heuristics 6

  • 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.
  • ClamAV: Xls.Downloader.Generic-6750544-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6750544-0
  • \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 10 \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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c50.bin rtf-objdata-decoded RTF \objdata at offset 0x2C50 28731 bytes
SHA-256: 45fa8b61a5dbc9b44fe3e282476d8bd76c314e10199922e131ba8654b8b8025c
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_01_off00016c96.bin rtf-objdata-decoded RTF \objdata at offset 0x16C96 28731 bytes
SHA-256: f13b4d9b1b13ae63777ea937c4451182ef5e01861af26b67b644ad1b4379cc1b
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_02_off0002acdc.bin rtf-objdata-decoded RTF \objdata at offset 0x2ACDC 28731 bytes
SHA-256: f60ef86ee73410268aca0d45a56b0e36b771a71d762973e3b0d96e674ebe72b9
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_05_off00066dae.bin rtf-objdata-decoded RTF \objdata at offset 0x66DAE 28731 bytes
SHA-256: aef35c1dcb7bf9b091a8d80d64c26bd1daf2bd5e63bfd135f3ccf1a63ce6866e
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_06_off0007adf4.bin rtf-objdata-decoded RTF \objdata at offset 0x7ADF4 28731 bytes
SHA-256: c4d1e7a00a0a9b2ba8c47062f82bdbc939166d6712664fa6fd8cc07ae6e42386
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_08_off000a2e80.bin rtf-objdata-decoded RTF \objdata at offset 0xA2E80 28731 bytes
SHA-256: 2155d9835e5fed17358210114e95a35df2ab4e0abe8c89751ee2cd1ba9b62c32
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely

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