Malicious RTF — malware analysis report

Static analysis result for SHA-256 feaf3ac1a35704bc…

MALICIOUS

RTF

737.1 KB Created: 2018-04-27 01:02:00 First seen: 2019-04-18
MD5: 6b8cd9d27cbaad504767745319947d67 SHA-1: b47cfce33d300e79b09424ea74b991adc536ba9c SHA-256: feaf3ac1a35704bc21c7fee84e36c8362f0fb29da808610bf93e52503cc3956a
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_off00002c21.bin rtf-objdata-decoded RTF \objdata at offset 0x2C21 24123 bytes
SHA-256: a8559008faa24a13897e63c15827dce61e9149225b6ecc6b7f1e458bf27532db
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off000142ab.bin rtf-objdata-decoded RTF \objdata at offset 0x142AB 24123 bytes
SHA-256: ca7f3d33cda96618528e669f1b991d441598e11419a4bdc0a36112146ed16c4e
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off00025935.bin rtf-objdata-decoded RTF \objdata at offset 0x25935 24123 bytes
SHA-256: adbbbe704a6afb9b4b31ff33bfc27f1988c4df6eba5f5d254e7b5e3ca08d19a7
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off00036fbf.bin rtf-objdata-decoded RTF \objdata at offset 0x36FBF 24123 bytes
SHA-256: 605e3d5ece4e32702ca54f948353aed2820cdbe0040060785375664fc5ea4d22
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off00048649.bin rtf-objdata-decoded RTF \objdata at offset 0x48649 24123 bytes
SHA-256: 06b6ed6efc63484503c2b54e2a5a3bf159bae6e8a8f2994ec3963cb065f876de
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off00059d1f.bin rtf-objdata-decoded RTF \objdata at offset 0x59D1F 24123 bytes
SHA-256: 25a15986c974a991a26910d506c197d8bf97497fb05c66c83250c3145ef8d2d0
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off0006b3a9.bin rtf-objdata-decoded RTF \objdata at offset 0x6B3A9 24123 bytes
SHA-256: ad721acf703a257dd4417514dcc29f085d52f7f9b11c7ba738f135851a7dcac0
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0007ca33.bin rtf-objdata-decoded RTF \objdata at offset 0x7CA33 24123 bytes
SHA-256: f1b3af99d1974ca45da0a9a46777c696630b4193f100da95660adbfe0b1f8008
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off0008e0bd.bin rtf-objdata-decoded RTF \objdata at offset 0x8E0BD 24123 bytes
SHA-256: c224377cf1f9460ce9234f1a3312fad2f46b98d0acccece34f3720494004aaa0
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off0009f747.bin rtf-objdata-decoded RTF \objdata at offset 0x9F747 24123 bytes
SHA-256: c006473f8eb8e3e8513dc3db14a5017a83e07818ecd9c6792235ba79f765ac79
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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