Xls.Dropper.Agent-9713525-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 0547b9ad623b3416…

MALICIOUS

Office (OLE) / .XLS

228.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 78aedb80e94ac9caad6097fef5936473 SHA-1: 7f114f05ec688e74584efa9fc792677fe55137c7 SHA-256: 0547b9ad623b3416f46adef429a06f65b153af1e8789063d3ba2171a1ed5865e
240 Risk Score

Malware Insights

Xls.Dropper.Agent-9713525-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The document body displays a social engineering lure to enable editing and content, further supporting the malicious intent. The ClamAV detection name 'Xls.Dropper.Agent-9713525-0' suggests its function is to drop a secondary payload.

Heuristics 5

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Xls.Dropper.Agent-9713525-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9713525-0
  • XLM Auto_Open environment-evasion HALT gate high OLE_XLM_ENVIRONMENT_EVASION_HALT
    Excel 4.0 macro sheet auto-executes multiple GET.WORKSPACE / GET.WINDOW environment checks and halts execution when the host does not match the expected user environment. This is a common sandbox-evasion pattern in XLM malware and is stronger than a bare XLM macro-sheet indicator.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9da0c0951c5b61e338a1abb9b8430611fcd303dbafce90d0d91c118301762619		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 328443 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.