Malicious RTF — malware analysis report

Static analysis result for SHA-256 fcce212c91c7d130…

MALICIOUS

RTF

921.2 KB Created: 2018-03-12 23:06:00 First seen: 2018-06-25
MD5: e1d3f6d3d6e3e0d4fbb240afdfab0c2c SHA-1: e24f15757477b6ce26ad4aecde1cfbc5d4904656 SHA-256: fcce212c91c7d130c4b9d8ede000c7e2417e7e92a81074b7ce0d9cd7b5dd40e7
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: Xls.Downloader.Generic-6750544-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6750544-0
  • \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 11 \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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c44.bin rtf-objdata-decoded RTF \objdata at offset 0x2C44 28731 bytes
SHA-256: 46db2654001f8d4f03322c48f13f35d2e69e7625e8ba2347d90056c04e8065de
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_01_off00016c7f.bin rtf-objdata-decoded RTF \objdata at offset 0x16C7F 28731 bytes
SHA-256: 5c4d7db151fe2038a17f9c3215ef7e6f4d9edd0ea8bb2a44c1686624f2b8d501
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_03_off0003ecf5.bin rtf-objdata-decoded RTF \objdata at offset 0x3ECF5 28731 bytes
SHA-256: aaddd1a5251767c76c6a671dcb0a9888f471683d4eb1185f7812b6dc5deaec45
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_05_off00066d6b.bin rtf-objdata-decoded RTF \objdata at offset 0x66D6B 28731 bytes
SHA-256: 64d5e7b94f3bead055dd2430ab7ccc330cfa72bd1ce65719a2a4c073d06009e3
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_07_off0008ede1.bin rtf-objdata-decoded RTF \objdata at offset 0x8EDE1 28731 bytes
SHA-256: ed56c11bdcfff1b8031f9d07734b6f7b5623d3e2ec1eb54846cac2971e6b67d8
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_09_off000b6e57.bin rtf-objdata-decoded RTF \objdata at offset 0xB6E57 28731 bytes
SHA-256: ff8e00c809820636572cc82afb64a6e2a963fef2a53a8620d3fb0b5784d5c871
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_10_off000cae92.bin rtf-objdata-decoded RTF \objdata at offset 0xCAE92 28731 bytes
SHA-256: 2d1a74333a593c7ef707313da740d7759f84c5aacbb118c0b8378c50a0d9c92b
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely

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