Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 eae000c7b8d2d890…

MALICIOUS

Office (OLE)

138.0 KB Created: 2020-06-18 12:27:39 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: cb7485d7453e4fc466d49c2f33e2cf09 SHA-1: eb042fb85919a04008a3885f90cba7cefbd01301 SHA-256: eae000c7b8d2d89059a194f7557ec16d775a239fd4e336add8c2a886b6b8a337
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, including an Auto_Open function, which is a strong indicator of malicious intent. The macros are designed to execute dangerous functions like RUN, suggesting they are intended to download and execute a second-stage payload from the obfuscated URL found in the document body. ClamAV also detected this file as a known dropper.

Heuristics 5

  • ClamAV: Xls.Dropper.Agent-8161229-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8161229-0
  • 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.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 104358 bytes
SHA-256: 36fef35dd647ef7d9ff806bb78570bc3ab5f8bc6e181bcf7c9022c7b2d10a7bd
Preview script
First 1,000 lines of the extracted script
' 0085     23 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden -  wrgBriwHpocOpM
' 0085     27 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  iayOHqZbvYcqnWjJJk
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     34 LABEL : Cell Value, String Constant - aaNzbxKYGXJNmbYSkhF len=0 
' 0018     62 LABEL : Cell Value, String Constant - aBmDGJBZDhRNCWNDRbKKwjLhtIpHswXLICURoKiokwzOjlu len=0 
' 0018     46 LABEL : Cell Value, String Constant - abZePIPtHGWZcUtIBlTVpSXkvQdRDeB len=0 
' 0018     21 LABEL : Cell Value, String Constant - aCYWyg len=0 
' 0018     39 LABEL : Cell Value, String Constant - aOXvpTVCWbjZFOONSovDhutK len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  wrgBriwHpocOpM!CK29651 
' 0018     42 LABEL : Cell Value, String Constant - aWizzWXgElPeLRksiOJKINxqxcD len=0 
' 0018     35 LABEL : Cell Value, String Constant - axsWYFZemcIRRQUryGkw len=0 
' 0018     30 LABEL : Cell Value, String Constant - ayFBNQezCLVQsJb len=0 
' 0018     46 LABEL : Cell Value, String Constant - bgSYfwXWmcfXvZECjYsiZnxggTTuEQr len=0 
' 0018     45 LABEL : Cell Value, String Constant - bjZFzByEovDTttKzCtTvaYGuPGwKVE len=0 
' 0018     51 LABEL : Cell Value, String Constant - BvZoHbuoeKTTSXIBImzyPSVNlBtdMOiLQdnJ len=0 
' 0018     19 LABEL : Cell Value, String Constant - bWLf len=0 
' 0018     23 LABEL : Cell Value, String Constant - bWzPiCVQ len=0 
' 0018     43 LABEL : Cell Value, String Constant - bXjzBWYhFmPfMSltiOKKJOyrydEp len=0 
' 0018     32 LABEL : Cell Value, String Constant - cfXvLEnVYsVZnxTgT len=0 
' 0018     52 LABEL : Cell Value, String Constant - cgiazcHrmbvmdqCkjXJkHThPgTXwkicurOkJP len=0 
' 0018     26 LABEL : Cell Value, String Constant - chSLTwKJZdf len=0 
' 0018     36 LABEL : Cell Value, String Constant - CjBmqQqCvOLhEcUQctIdR len=0 
' 0018     53 LABEL : Cell Value, String Constant - cROIaXuQouqCGUprBLFiyRlFyoUddcgSLSwJJY len=0 
' 0018     54 LABEL : Cell Value, String Constant - cSxstrwhaiMnYosumMoTEznJypEOwwjWwTgubsf len=0 
' 0018     37 LABEL : Cell Value, String Constant - DcrkUCEZCGUeyNzmNjiLsK len=0 
' 0018     20 LABEL : Cell Value, String Constant - dcsvy len=0 
' 0018     35 LABEL : Cell Value, String Constant - DDCHrxGWwvMCFwVydbJx len=0 
' 0018     35 LABEL : Cell Value, String Constant - DosTHExQNkGekgsvKfhq len=0 
' 0018     38 LABEL : Cell Value, String Constant - DPghDENlSvLrxRZPupqoteX len=0 
' 0018     64 LABEL : Cell Value, String Constant - DtHRzznZBXjxfwimNBysLIezYeampFabkupTiBVoiYENOMRCu len=0 
' 0018     20 LABEL : Cell Value, String Constant - DUGKj len=0 
' 0018     62 LABEL : Cell Value, String Constant - eDSLudfzchuFanbNoLKlTkWaBamgxvSnMFBMdrOBLidHIoJ len=0 
' 0018     40 LABEL : Cell Value, String Constant - eJjVlprjJlQBvkFvmzLtsgStQ len=0 
' 0018     47 LABEL : Cell Value, String Constant - ELpQCSVYQpSwhcRlcTgraZNyawJXFWIM len=0 
' 0018     52 LABEL : Cell Value, String Constant - EoWYsVaoyTgUHhEDfMdQUtUfZroLhGxtGWlHu len=0 
' 0018     29 LABEL : Cell Value, String Constant - epsIdeoxsWlFZr len=0 
' 0018     27 LABEL : Cell Value, String Constant - EPVRctuQRbyf len=0 
' 0018     59 LABEL : Cell Value, String Constant - EQsMrPhthfZqoLuFLHTkkHIRoWzPvCVdTytusxibiNnZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - eypftEmm len=0 
' 0018     63 LABEL : Cell Value, String Constant - eZZYdOVcsTTiYbTrVzxfUofWjtdcQQrzMoInLdpdbVnkHqCH len=0 
' 0018     39 LABEL : Cell Value, String Constant - FaDHVRzOnnOXjMfLiBaBMGYI len=0 
' 0018     19 LABEL : Cell Value, String Constant - Fazr len=0 
' 0018     56 LABEL : Cell Value, String Constant - FBMdezBLiPsJovPWMrnnlqcVcHhTimphGiOxtiDsj len=0 
' 0018     52 LABEL 
... (truncated)

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