Malicious RTF — malware analysis report

Static analysis result for SHA-256 0a7c51f40a3feb75…

MALICIOUS

RTF

918.5 KB Created: 2018-05-07 First seen: 2018-07-14
MD5: dd284c82ebadd92320128776617642de SHA-1: 92b6027ef57a4d483a51b0281fa3d534191608ba SHA-256: 0a7c51f40a3feb75cef27cb864fdbca465795a7ef55522488ae683f8d7ad9574
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_off00002c0b.bin rtf-objdata-decoded RTF \objdata at offset 0x2C0B 33339 bytes
SHA-256: 74dcfc941c3f5eabbeed17fa64edd4c8922fc163f8238e7e323aa3db4a01d084
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: 1148149bc4ecd8d2a2a12a0851cd088cedda41efa40460c768e63c2ac1d3791d
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002ea3b.bin rtf-objdata-decoded RTF \objdata at offset 0x2EA3B 33339 bytes
SHA-256: 6af4c3b8918bd2daee7b3cf86b8b3fd9f6fff97a66edbb4dc2982806295e94bb
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off00044953.bin rtf-objdata-decoded RTF \objdata at offset 0x44953 33339 bytes
SHA-256: 72b2fa4225aac85f7af920a962a92aded1ea91d0aa470760ca7e0f1a03a2472c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a86b.bin rtf-objdata-decoded RTF \objdata at offset 0x5A86B 33339 bytes
SHA-256: 92ead894422061a7e0970ee2a48554886fa06d02ab7c74cae486bfe4efb0024f
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off000707cd.bin rtf-objdata-decoded RTF \objdata at offset 0x707CD 33339 bytes
SHA-256: 3eb25b3927af2aaae5267e449825ee77439e48eb4ab2049684d7daf2c7f1a2c4
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off000866e5.bin rtf-objdata-decoded RTF \objdata at offset 0x866E5 33339 bytes
SHA-256: a088dfb60e8d99dd43afa710bf82a52b51c1276da51b37bcdeab0996700e11b7
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c5fd.bin rtf-objdata-decoded RTF \objdata at offset 0x9C5FD 33339 bytes
SHA-256: d0b5fbbde6df5d56e92d55cf1366366a47ecd8935c146b02a74804ff56eb9441
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b2515.bin rtf-objdata-decoded RTF \objdata at offset 0xB2515 33339 bytes
SHA-256: a9c354aed16a87de675d8be772ddadfe1d1687f8e8ceeed2b52c13d0d71e6436
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c842d.bin rtf-objdata-decoded RTF \objdata at offset 0xC842D 33339 bytes
SHA-256: f48d221e954ab82ca9ea3b8285b8ef9dc8209b3751cabd52be33a1f1018cf2d8
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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