Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 afaf1bc1ded2ed17…

MALICIOUS

Office (OLE)

170.5 KB Created: 2020-07-08 02:35:04 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 9eac723703a6083dc95826b897ed3d06 SHA-1: fe30ebddf84635377f0ff3084aac1c9c09bbec26 SHA-256: afaf1bc1ded2ed173f409c8d691769feb25d61fded0a727449c6db05525aee60
280 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits critical heuristic firings related to Excel 4.0 macros, including an Auto_Open function and environment evasion. The presence of an Auto_Open macro indicates an attempt to automatically execute code upon opening the document, a common technique for malware droppers. The heuristic 'SE_ENABLE_LURE' suggests the document prompts the user to enable macros, further supporting its role as a malicious attachment.

Heuristics 6

  • ClamAV: Xls.Dropper.Agent-8699777-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8699777-0
  • 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.
  • XLM Auto_Open environment-evasion close gate critical OLE_XLM_ENVIRONMENT_EVASION_CLOSE
    Excel 4.0 macro sheet auto-executes environment checks with GET.WORKSPACE / GET.WINDOW, then shows a fake corruption/error message and closes the workbook when the host fails those checks. This is a malware sandbox-evasion pattern, even when the later payload stage is hidden behind obfuscated defined-name flow.
  • 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) 52212 bytes
SHA-256: 1cadd4273d53264e411a40620e3a1c91d6c59f6ca127da86a39edcb00f685425
Preview script
First 1,000 lines of the extracted script
' 0085      9 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  
' 0085     22 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  DkOPvDVdTytus
' 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     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  !BV5730 
' 0018     23 LABEL : Cell Value, String Constant - aWLfVMak len=0 
' 0018     17 LABEL : Cell Value, String Constant - aX len=0 
' 0018     22 LABEL : Cell Value, String Constant - axhrxtG len=0 
' 0018     38 LABEL : Cell Value, String Constant - bgdoGHcdmLrVkRXqyoUPQOT len=0 
' 0018     41 LABEL : Cell Value, String Constant - BgEWiWUOgdzjuzwIZavwGeLoEk len=0 
' 0018     44 LABEL : Cell Value, String Constant - BHPfGFVLOGeImkSHbRIWgPPCDdmyb len=0 
' 0018     22 LABEL : Cell Value, String Constant - bIOhpfL len=0 
' 0018     48 LABEL : Cell Value, String Constant - biyZYoehZxbGElaulbpziiVWwGSuOsRjv len=0 
' 0018     55 LABEL : Cell Value, String Constant - BLRNZpFMOXupTVCIbjZFzzyEovDTttJyCtSvaYGu len=0 
' 0018     42 LABEL : Cell Value, String Constant - bQkbSfpYYMMmvIkEjHZlZWQifDm len=0 
' 0018     31 LABEL : Cell Value, String Constant - BsRuZXFtOFvJTDCp len=0 
' 0018     50 LABEL : Cell Value, String Constant - bUbGTSilogGUNxfhCejwIcpdPqNMnVmYcDd len=0 
' 0018     23 LABEL : Cell Value, String Constant - bVnkHdCt len=0 
' 0018     22 LABEL : Cell Value, String Constant - BWJTqlP len=0 
' 0018     39 LABEL : Cell Value, String Constant - bWnlIdCuqCThEqBYTwxeyEMC len=0 
' 0018     51 LABEL : Cell Value, String Constant - CcbrhkcBeJHodxnesDllYYzIVwRvUlxmjdvs len=0 
' 0018     35 LABEL : Cell Value, String Constant - cDZYBhzlpPpBuNKgDbTP len=0 
' 0018     23 LABEL : Cell Value, String Constant - CGIzZogR len=0 
' 0018     19 LABEL : Cell Value, String Constant - chFM len=0 
' 0018     22 LABEL : Cell Value, String Constant - ChFXjXU len=0 
' 0018     28 LABEL : Cell Value, String Constant - CosSGExQNjGek len=0 
' 0018     17 LABEL : Cell Value, String Constant - Cr len=0 
' 0018     33 LABEL : Cell Value, String Constant - csZfyHvbXXWaMFMqRD len=0 
' 0018     32 LABEL : Cell Value, String Constant - DDemybuayQcQOIaXt len=0 
' 0018     60 LABEL : Cell Value, String Constant - dHIovOWMrmnlqbipGhgwmpgGiOLthDsjxIqqddFNaCVBZ len=0 
' 0018     39 LABEL : Cell Value, String Constant - dKSTRWHBIlyxOSVMlBtdLNiL len=0 
' 0018     50 LABEL : Cell Value, String Constant - DLBgppotQXeJWVlorjIXQzikFhmzwfsSStC len=0 
' 0018     63 LABEL : Cell Value, String Constant - dotqCTUpqzYFixekEMChcdbgRKSvXIYceWvYDnjXsiZnxggT len=0 
' 0018     20 LABEL : Cell Value, String Constant - DpRnl len=0 
' 0018     48 LABEL : Cell Value, String Constant - DSZbkIDgiPVowlSNNMRCJQgHGWMPHfJnl len=0 
' 0018     21 LABEL : Cell Value, String Constant - DTtsJy len=0 
' 0018     24 LABEL : Cell Value, String Constant - ECHrkrWwi len=0 
' 0018     50 LABEL : Cell Value, String Constant - EILCbqjTBEYBFTdyMylMihKrJuyYyKEWTpM len=0 
' 0018     17 LABEL : Cell Value, String Constant - eJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - ElnIkp len=0 
' 0018     18 LABEL : Cell Value, String Constant - Eov len=0 
' 0018     50 LABEL : Cell Value, String Constant - esfSsPOqXpbfFfqkDzWsRJFRhwSGPmhLNtO len=0 
' 0018     25 LABEL : Cell Value, String Constant - EwEiJuLPRJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - FfqkDlIrD len=0 
' 0018     31 LABEL : Cell Value, String Constant - fKiBaBMGYHeOYeam len=0 
' 0018     22 LABEL : Cell Value, String Constant - FLemcID len=0 
' 0018     23 LABEL : Cell Value, String Constant - FLHSWkGI len=0 
' 0018     50 LABEL : Cell Value, String Constant - FlrLTJojkinYSZDePfjldDfKuqezpguFnna len=0 
' 0018     27 LABEL : Cell Value, String Constant - fmQdcswzqQfY len=0 
' 0018     64 LABEL : Cell Value, String Constant - GgDQeLcPTsgeYqnKgFLHSVkGHRaVyOhCUPFkstrwibiMZYosv 
... (truncated)

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