Malicious RTF — malware analysis report

Static analysis result for SHA-256 3d021acec5682e05…

MALICIOUS

RTF

787.5 KB Created: 2018-04-18 02:06:00 First seen: 2018-04-30
MD5: 56c76c8c355fcd589ffd4c107ee176dc SHA-1: f342af95c428052550a4efd70ae1500aadd39fd0 SHA-256: 3d021acec5682e0528e44fb5e6f7afdfcf4743732462c4ff3162eb804c0964ea
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-6940825-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6940825-0
  • \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_off00002c15.bin rtf-objdata-decoded RTF \objdata at offset 0x2C15 26683 bytes
SHA-256: 169ef19e43e4c704026adf8aa76153e6451ee87484ba701f00f9f10d443febf2
Detection
ClamAV: Doc.Dropper.Agent-6940825-0
Obfuscation or payload: unlikely
objdata_01_off000156c3.bin rtf-objdata-decoded RTF \objdata at offset 0x156C3 26683 bytes
SHA-256: 5f29472737816a0d7324615d80f0fee859e6c1485420001391739f1e88268954
Detection
ClamAV: Doc.Dropper.Agent-6940825-0
Obfuscation or payload: unlikely
objdata_02_off00028171.bin rtf-objdata-decoded RTF \objdata at offset 0x28171 26683 bytes
SHA-256: 01871388ef0a244065528bbb4d6b691d23ac79e039553a1e38e0e004b52d5590
Detection
ClamAV: Doc.Dropper.Agent-6940825-0
Obfuscation or payload: unlikely
objdata_03_off0003ac1f.bin rtf-objdata-decoded RTF \objdata at offset 0x3AC1F 26683 bytes
SHA-256: 29ca6a5a28aabccb5f880d694e9ea6a4de20f7c514a2db8d376031acc1db129a
Detection
ClamAV: Doc.Dropper.Agent-6940825-0
Obfuscation or payload: unlikely
objdata_04_off0004d6cd.bin rtf-objdata-decoded RTF \objdata at offset 0x4D6CD 26683 bytes
SHA-256: e0ce4769df5a21de883d9fd65e3ce50d9f3da8c47fc78f64ee2bd73efee58350
Detection
ClamAV: Doc.Dropper.Agent-6940825-0
Obfuscation or payload: unlikely
objdata_05_off000601c5.bin rtf-objdata-decoded RTF \objdata at offset 0x601C5 26683 bytes
SHA-256: 537dda2ae9f92d0d2b82ef897e6c43133ec19e9eb6d5a431ebe9b0853a6945a0
Detection
ClamAV: Doc.Dropper.Agent-6940825-0
Obfuscation or payload: unlikely
objdata_06_off00072c73.bin rtf-objdata-decoded RTF \objdata at offset 0x72C73 26683 bytes
SHA-256: c78964608bdf7b9c76e1710c050c350ab1325b5ca37e33070067592b6d672503
Detection
ClamAV: Doc.Dropper.Agent-6940825-0
Obfuscation or payload: unlikely
objdata_07_off00085721.bin rtf-objdata-decoded RTF \objdata at offset 0x85721 26683 bytes
SHA-256: 7762e1fc3979743fb7b8def91f930d6558d4518d6457b2be9957d3b103a6a83c
Detection
ClamAV: Doc.Dropper.Agent-6940825-0
Obfuscation or payload: unlikely
objdata_08_off000981cf.bin rtf-objdata-decoded RTF \objdata at offset 0x981CF 26683 bytes
SHA-256: c9381f32bb817f789cd9768d4e5807b90de20b6dd98b2e0a64754474c016c6e3
Detection
ClamAV: Doc.Dropper.Agent-6940825-0
Obfuscation or payload: unlikely
objdata_09_off000aac7d.bin rtf-objdata-decoded RTF \objdata at offset 0xAAC7D 26683 bytes
SHA-256: 21f89cff1f73d09fb51a48bd476ebefaa1309de484c0834a84c14fc529a5dcf7
Detection
ClamAV: Doc.Dropper.Agent-6940825-0
Obfuscation or payload: unlikely

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