Malicious RTF — malware analysis report

Static analysis result for SHA-256 4f6dd728633bba78…

MALICIOUS

RTF

776.0 KB Created: 2017-11-10 20:42:00 First seen: 2017-11-29
MD5: ed762d8a73e9aedd35f6b51056325138 SHA-1: c2e6ffbba660b95246154ffb874422f792565a8a SHA-256: 4f6dd728633bba78841da6fce1ce9a3e8673830588bd51e2bfd283e2afcb0ecb
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, with heuristics indicating that \objupdate forces OLE activation. Critical firings for CVE-2017-8759 and ClamAV detection confirm the exploitation of this vulnerability. This suggests the file is designed to execute malicious code via the embedded object, likely as a downloader for a second-stage 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.Macro.Obfuscation-6391394-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6391394-0
  • \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 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002a87.bin rtf-objdata-decoded RTF \objdata at offset 0x2A87 26171 bytes
SHA-256: 9c5e0c2a29b3914ca8df6bddb76b2561dc7ee8c4956b35f2c198a7bb8970f7ad
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_01_off000150d6.bin rtf-objdata-decoded RTF \objdata at offset 0x150D6 26171 bytes
SHA-256: adfedcb8776dd46400f2321bec34ec6b84b8bccd27f0d72195cc9dd3f414b782
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_02_off00027727.bin rtf-objdata-decoded RTF \objdata at offset 0x27727 26171 bytes
SHA-256: 376e65e2fa01a61107164ed7c00d2eb541ef6e26ee2a165ba0174514c541607a
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_03_off00039d78.bin rtf-objdata-decoded RTF \objdata at offset 0x39D78 26171 bytes
SHA-256: 8b62eae15d5fa2ca0131146172b34741f04d20329948d9af628a7c9b49a93492
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_04_off0004c3c9.bin rtf-objdata-decoded RTF \objdata at offset 0x4C3C9 26171 bytes
SHA-256: 7c9588b8045a7bb4ddf113a9bbe638004fa02406a951d033a10bd896b519671e
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_05_off0005ea1a.bin rtf-objdata-decoded RTF \objdata at offset 0x5EA1A 26171 bytes
SHA-256: 59524809b8cf1ef0cd0971e952870f8e033f7ea6fc0c7d8bde2610a932ad2d10
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_06_off0007106b.bin rtf-objdata-decoded RTF \objdata at offset 0x7106B 26171 bytes
SHA-256: a3c5f1b5edb653fa210873b3bc5b2e0b303a86eaacc3915b0016a3378a5e794b
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_07_off000836bc.bin rtf-objdata-decoded RTF \objdata at offset 0x836BC 26171 bytes
SHA-256: 48d95c4cfffcd92012fb2f7810a74ca6f431d5de177eaa69bac78bf51cd12d42
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_08_off00095d0d.bin rtf-objdata-decoded RTF \objdata at offset 0x95D0D 26171 bytes
SHA-256: 1f76ab4b94338d4e854f613aa56d8adb764e4c9450cf73293d56427d595fcfaa
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_09_off000a835e.bin rtf-objdata-decoded RTF \objdata at offset 0xA835E 26171 bytes
SHA-256: c4498a7e0ddad49dd84e36d8b3433665c87f7d7bd4c1923001e75146010c3c67
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely

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