Xls.Dropper.Agent-8127463-0 — RTF malware analysis

Static analysis result for SHA-256 b85d144f7a569c9e…

MALICIOUS

RTF

360.4 KB Authoring application: Riched20 10.0.18362
MD5: 2541c660e7d3e16ff366c4e4c1260da3 SHA-1: 64a6fb13e873246edcc6c92d4035d508afd43926 SHA-256: b85d144f7a569c9eb11a2ffd9fd9861c8616837210d1c2906ce96546a1b5ce3e
160 Risk Score

Malware Insights

Xls.Dropper.Agent-8127463-0 · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains multiple embedded OLE objects, with heuristics indicating the use of \objupdate to force activation. ClamAV identifies the sample as Xls.Dropper.Agent-8127463-0, suggesting it functions as a dropper. The embedded objects likely contain malicious code designed to download and execute a secondary payload.

Heuristics 5

  • ClamAV: Xls.Dropper.Agent-8127463-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8127463-0
  • \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 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000106.bin
98af9b8e27106e3f83d7a67c7c621043d397b32b9b25c093696fab7a31058573		 rtf-objdata-decoded RTF \objdata at offset 0x106 53764 bytes
objdata_01_off0001e146.bin
f599a40404e6c59dfd74cc56a17ce69078760602141060e5ff63390e536e63d7		 rtf-objdata-decoded RTF \objdata at offset 0x1E146 53764 bytes
objdata_02_off0003c18c.bin
0291afa98629c6cd8a2c53c12925a04a645ec73344935e0cf7b7b39b498b6d8e		 rtf-objdata-decoded RTF \objdata at offset 0x3C18C 53764 bytes

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