Malicious RTF — malware analysis report

Static analysis result for SHA-256 397cf3f11f738dbd…

MALICIOUS

RTF

5.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2019-08-04
MD5: bc2ca50b6e11663f22763d926280d52a SHA-1: b5adb3cfa55168707672b57e78db4c0edb6166f5 SHA-256: 397cf3f11f738dbd456fe1cea9ec29175aa11560b3c1c9d30f49a256ad30d1c1
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an OLE object that leverages CVE-2017-0199 to automatically link and update from a remote URL. This technique is commonly used to download and execute a secondary payload. The embedded URL 'http://192.168.1.112:8080//homer' is the primary indicator of compromise.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 1 \objdata section(s) — embedded OLE objects
  • 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://192.168.1.112:8080//homer In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000104.bin rtf-objdata-decoded RTF \objdata at offset 0x104 2724 bytes
SHA-256: f8f3dffd299cf5ecc0752d6ccc1169c0cfa4d995415579d8bb179cb590405c90

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