Xls.Malware.Sload-7135989-0 — RTF malware analysis

Static analysis result for SHA-256 c16d68a18b0d7129…

MALICIOUS

RTF

495.4 KB Created: 2018-06-07 12:53:00 First seen: 2018-07-04
MD5: d218b738ea6c7b0a3dc3059af5415342 SHA-1: bf03e2679b4f7c53fedec2021e067334b351db72 SHA-256: c16d68a18b0d71298de6819b7a921f0f0cd5518f50903c40a5d50b0345a1733d
242 Risk Score

Malware Insights

Xls.Malware.Sload-7135989-0 · confidence 95%

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

The RTF file contains multiple OLE objects, with heuristics indicating ".objupdate" forces OLE activation and the presence of Composite Monikers. ClamAV signatures identify the embedded content as Xls.Malware.Sload-7135989-0, suggesting an exploit targeting spreadsheet functionality. The primary attack vector is likely spearphishing, with the embedded OLE object serving as the malicious payload.

Heuristics 6

  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • ClamAV: Xls.Malware.Sload-7135989-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Sload-7135989-0
  • \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 5 \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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003d13.bin rtf-objdata-decoded RTF \objdata at offset 0x3D13 32827 bytes
SHA-256: f3353b5b11254978c66d4fb6dc7385703330c89899b150254910ba05ed7bbe1f
Detection
ClamAV: Xls.Malware.Sload-7135989-0
Obfuscation or payload: unlikely
objdata_03_off000447c2.bin rtf-objdata-decoded RTF \objdata at offset 0x447C2 32827 bytes
SHA-256: 81a7a9dbf236b766c01cb5a8d7a0ff1f22404aac0310b639b4c8232602e461a9
Detection
ClamAV: Xls.Malware.Sload-7135989-0
Obfuscation or payload: unlikely

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