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

Static analysis result for SHA-256 760fed948088349a…

MALICIOUS

RTF

495.4 KB Created: 2018-06-07 12:49:00 First seen: 2018-07-04
MD5: 786d1ffda4e9adf5898d5f385a2db40e SHA-1: 5152c1db948cb8d353b025030304fcdb3cbf2abc SHA-256: 760fed948088349acc896a11b8197acc50e17e4839b8cc8d3505e97d689dee5a
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: d03fbadb3b1e051469b0050fadd05e28e75bd216b369fd00e4e45e0a258519c6
Detection
ClamAV: Xls.Malware.Sload-7135989-0
Obfuscation or payload: unlikely
objdata_02_off0002eedd.bin rtf-objdata-decoded RTF \objdata at offset 0x2EEDD 32827 bytes
SHA-256: a44841bd1518a2913699fbf0da175cccc033e8d094f5ae9f7ccaf9b4b6c7cd3c
Detection
ClamAV: Xls.Malware.Sload-7135989-0
Obfuscation or payload: unlikely

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