Malicious RTF — malware analysis report

Static analysis result for SHA-256 cd185f4d231bb253…

MALICIOUS

RTF

737.1 KB Created: 2018-04-27 01:43:00 First seen: 2018-06-19
MD5: 72a63f3686097bc752a144e46f421791 SHA-1: b257642deaf1125398ccdc6264182be7989a8dcb SHA-256: cd185f4d231bb2535b83e80d5900525c977dc2f885c3d31c8663ac80ac2bcec3
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: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • \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 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 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c1b.bin rtf-objdata-decoded RTF \objdata at offset 0x2C1B 24123 bytes
SHA-256: 13ab67b8a0d30e234aa76ccad1c3d96bb83d9e36361899cf37a1c9bf80ccbd9c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off000142a5.bin rtf-objdata-decoded RTF \objdata at offset 0x142A5 24123 bytes
SHA-256: 6af2c4e91fe6b2086126a8aa2a7bb128f8941ba8e682f06b666cba747fdfe5bc
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002592f.bin rtf-objdata-decoded RTF \objdata at offset 0x2592F 24123 bytes
SHA-256: 268a7724e4e968ee188efb4e6f6257583a2c9f6f2ee1c21c519c34f4e01d1840
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off00036fb9.bin rtf-objdata-decoded RTF \objdata at offset 0x36FB9 24123 bytes
SHA-256: 33cad9d2c90ea8ca8e07c871d0bf75aba9970d774c1cd15177fbe3fc591c8e04
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off00048643.bin rtf-objdata-decoded RTF \objdata at offset 0x48643 24123 bytes
SHA-256: 77b5ebbcb8444d74312317a0b6e14bc76c6a4563a96087edb3cf4852b9118cf7
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off00059d19.bin rtf-objdata-decoded RTF \objdata at offset 0x59D19 24123 bytes
SHA-256: 6610b3f9e3ebbb095b9ace28dd23a9e65fb0301113fe5361d6e6677e2cd843ff
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off0006b3a3.bin rtf-objdata-decoded RTF \objdata at offset 0x6B3A3 24123 bytes
SHA-256: 41cfa3aca80ff936bb0e9e85103e20334fb065393b69bc1470eadc941210fde3
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0007ca2d.bin rtf-objdata-decoded RTF \objdata at offset 0x7CA2D 24123 bytes
SHA-256: 75a3e6d88d602787916b22e80b3207eb733b591e20ca2d5342f2050e13453172
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off0008e0b7.bin rtf-objdata-decoded RTF \objdata at offset 0x8E0B7 24123 bytes
SHA-256: 9526fcbec971f7f088afbb96dc32cb6afb133e171e69204abdb401df37518d63
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off0009f741.bin rtf-objdata-decoded RTF \objdata at offset 0x9F741 24123 bytes
SHA-256: e6f9f9e533e62a7584468550aa771eea88da157b03bcdc49dce4f0f1e413636d
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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