Xls.Dropper.Agent-7640771-0 — RTF malware analysis

Static analysis result for SHA-256 50f8ec724a817c04…

MALICIOUS

RTF

837.5 KB Created: 2020-03-09 23:10:00 First seen: 2021-02-18
MD5: d2882ae79060572ec491b2e992796887 SHA-1: 1177baacc2fe6a47a81b64f1d9b29e9395460c3a SHA-256: 50f8ec724a817c04d49059f4aa9c990a631e6faa95fb149f701cc7841d96c839
142 Risk Score

Malware Insights

Xls.Dropper.Agent-7640771-0 · confidence 95%

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

The file is an RTF document containing multiple embedded OLE objects, with a specific heuristic indicating that \objupdate forces OLE activation. ClamAV identifies this as Xls.Dropper.Agent-7640771-0, suggesting it's a dropper. The embedded objects are likely designed to exploit vulnerabilities or execute malicious payloads when the document is opened and the objects are updated.

Heuristics 5

  • ClamAV: Xls.Dropper.Agent-7640771-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7640771-0
  • \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 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c9f.bin rtf-objdata-decoded RTF \objdata at offset 0x2C9F 38958 bytes
SHA-256: 87d60177bf61ffdf7a85c4771518437b77eaa0c2abb81ec0d278b8ef172b0285
objdata_01_off00016b4d.bin rtf-objdata-decoded RTF \objdata at offset 0x16B4D 38958 bytes
SHA-256: f552e3b058967ce4e1b4c3e1388d0f91a9777c7e659065201471ff2860f66da6
objdata_03_off0003ead0.bin rtf-objdata-decoded RTF \objdata at offset 0x3EAD0 38958 bytes
SHA-256: 1c3e6366c8013a89047195d0384f79c58ad575613234bcc9c5f36e4e5e7c38ef
objdata_04_off00052a93.bin rtf-objdata-decoded RTF \objdata at offset 0x52A93 38958 bytes
SHA-256: 6b4a04f944aa89e8067abe936a219f3c71c844904daa732d35f7582e2e3bafc0
objdata_07_off0008e9dc.bin rtf-objdata-decoded RTF \objdata at offset 0x8E9DC 38958 bytes
SHA-256: 28b166120cb157ec545b55b7eca6b7eb851617a1d82fa754107c32893aa86462

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