Malicious RTF — malware analysis report

Static analysis result for SHA-256 d9172e27f6857663…

MALICIOUS

RTF

918.5 KB Created: 2018-05-07 02:18:00 First seen: 2018-05-18
MD5: e13db4cd16b03f1d2f67e18a4e3482ea SHA-1: 466440f94f7525155f01905d450c31bcc6a7b1a3 SHA-256: d9172e27f6857663b1f2f39e0897d269c05ddbb67bb1a779d9ff866add4ae3b8
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_off00002c1a.bin rtf-objdata-decoded RTF \objdata at offset 0x2C1A 33339 bytes
SHA-256: 037f967310dc21986c75ef26c5e0a6b8f531b227c97d8fb1515c6b36c2798250
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018b36.bin rtf-objdata-decoded RTF \objdata at offset 0x18B36 33339 bytes
SHA-256: 58213b76b7223fc5629bb991e26a5c92748a60223f3c36ea24675ea1dcfdfcff
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002ea52.bin rtf-objdata-decoded RTF \objdata at offset 0x2EA52 33339 bytes
SHA-256: 5308d5198e987d0cc5f35ee17858171fe204cf1bb49604e33fe49cd24d98afbb
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off0004496e.bin rtf-objdata-decoded RTF \objdata at offset 0x4496E 33339 bytes
SHA-256: 08d9972b2e81cc0eeb9ff3074a48367a478176af0bf9aede1cc620b210b698a8
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a88a.bin rtf-objdata-decoded RTF \objdata at offset 0x5A88A 33339 bytes
SHA-256: e7dcad549b8e9cd20cd4b6de60963a045dd96f4ecdbb110c47f53720dd5c1a2b
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off000707f2.bin rtf-objdata-decoded RTF \objdata at offset 0x707F2 33339 bytes
SHA-256: fa74607682fc87ee6c762afe9b30a9def89e07d5b6bc2e9f63afc05b69f1927e
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off0008670e.bin rtf-objdata-decoded RTF \objdata at offset 0x8670E 33339 bytes
SHA-256: 1c4c64d74d0a48db5f8970971a620288879ea7aa191ff8ca2ef55ddccc250427
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c62a.bin rtf-objdata-decoded RTF \objdata at offset 0x9C62A 33339 bytes
SHA-256: 323ac088bcb4a4e1fca7d47ae6f7b4922f302badf8261d8eaf892003726bc192
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b2546.bin rtf-objdata-decoded RTF \objdata at offset 0xB2546 33339 bytes
SHA-256: f4ac3474c032f349c8603185672becfa7ef27d100575291059b4d366a35db25d
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c8462.bin rtf-objdata-decoded RTF \objdata at offset 0xC8462 33339 bytes
SHA-256: 2179816a8d7bee143235dfa1cd55c86641172492045bbacb76be71099fcc3f11
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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