Malicious RTF — malware analysis report

Static analysis result for SHA-256 fb4c58f52de03f3d…

MALICIOUS

RTF

918.4 KB Created: 2018-05-07 02:38:00 First seen: 2018-07-27
MD5: 9378d6cb44dccfe754b15a6b2a1923dd SHA-1: d67f96ee3fd431a5e4ceed9f2414b3ee1d9fdced SHA-256: fb4c58f52de03f3d2fea8bcb582b0bbb21cad0a29e504b3284a4fe7f6d6844c5
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_off00002c0f.bin rtf-objdata-decoded RTF \objdata at offset 0x2C0F 33339 bytes
SHA-256: 8e03c28294a174b2f496f7892859affba2749ae65b601dbd94f6ab96817e2897
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018b23.bin rtf-objdata-decoded RTF \objdata at offset 0x18B23 33339 bytes
SHA-256: 6822998df1e7fce121910eb21f58155ca9fa52fcf9f112bbe84994f800b22e39
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002ea37.bin rtf-objdata-decoded RTF \objdata at offset 0x2EA37 33339 bytes
SHA-256: 0cc1d95b1d2bb44702f4a30440bebd659ebaa72cc69be558644aa4143ac1b810
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off0004494b.bin rtf-objdata-decoded RTF \objdata at offset 0x4494B 33339 bytes
SHA-256: b6bb9ebfdfd9c3b0391aa9899cd403b14b0a84f4c64778485a70b7fe0165b827
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a85f.bin rtf-objdata-decoded RTF \objdata at offset 0x5A85F 33339 bytes
SHA-256: 4765fb35bd1dde1163227793a584b11a6855049db6cac739f3e3814d6249bbe7
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off000707bb.bin rtf-objdata-decoded RTF \objdata at offset 0x707BB 33339 bytes
SHA-256: 930e95d0312c1a40b39b16da8a7023e9ff25cb79edc56ebf5ff65f719816f04e
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off000866cf.bin rtf-objdata-decoded RTF \objdata at offset 0x866CF 33339 bytes
SHA-256: 011bc2375d1241ac84a4ef2b9f5f28bbfe3c08f91181274ca1c1c876c52e14a2
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c5e3.bin rtf-objdata-decoded RTF \objdata at offset 0x9C5E3 33339 bytes
SHA-256: d97038cab6aab7221f3e02edbdd1023a49f6037e6ea43cffba3f7ad486338645
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b24f7.bin rtf-objdata-decoded RTF \objdata at offset 0xB24F7 33339 bytes
SHA-256: bce167eaa6f0ce73cc4376500c12a471deb261351753525e72556857d91363aa
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c840b.bin rtf-objdata-decoded RTF \objdata at offset 0xC840B 33339 bytes
SHA-256: 1091d0ce93118c32d865fe63a40ba135e4d1f484752785a95573ba1a0c6b5b6b
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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