Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 51b0f54968f86c38…

MALICIOUS

Office (OLE)

90.0 KB Created: 2020-07-02 15:46:44 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 39111414d855d02ea4b594cffe92577f SHA-1: 24eaa43be83c0bf18157932d36af5f3f264423c7 SHA-256: 51b0f54968f86c38ab946adf91acd3c41928779fa12e22ae77da3d3fdc6762c4
220 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a critical indicator of malicious activity. The presence of a 'Macro/content-enable lure' heuristic suggests the document attempts to trick the user into enabling macros. ClamAV also detected it as a dropper. The XLM macro sheet contains an Auto_Open entry, indicating it's designed to execute automatically.

Heuristics 5

  • ClamAV: Xls.Dropper.Agent-9252680-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9252680-0
  • 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) 30689 bytes
SHA-256: eee2a74a1e63cfeff0a317a4cdf003d359a75dab6d337f095eef2fd2c0979fa0
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Sheet
' 0085     11 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  JF
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     22 LABEL : Cell Value, String Constant - aehYxNF len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!JH13589 
' 0018     24 LABEL : Cell Value, String Constant - bmgyvToNG len=0 
' 0018     24 LABEL : Cell Value, String Constant - CasSsExQy len=0 
' 0018     20 LABEL : Cell Value, String Constant - cBQJs len=0 
' 0018     21 LABEL : Cell Value, String Constant - CPOehk len=0 
' 0018     23 LABEL : Cell Value, String Constant - cYYXcNTb len=0 
' 0018     20 LABEL : Cell Value, String Constant - dfoMH len=0 
' 0018     23 LABEL : Cell Value, String Constant - diTNUxLK len=0 
' 0018     22 LABEL : Cell Value, String Constant - DMjRtKq len=0 
' 0018     24 LABEL : Cell Value, String Constant - dRRsBNpJo len=0 
' 0018     23 LABEL : Cell Value, String Constant - DTzGZhWC len=0 
' 0018     23 LABEL : Cell Value, String Constant - ejrhNWWV len=0 
' 0018     21 LABEL : Cell Value, String Constant - EkqKSI len=0 
' 0018     21 LABEL : Cell Value, String Constant - EuJTCC len=0 
' 0018     23 LABEL : Cell Value, String Constant - FVZbTsIz len=0 
' 0018     21 LABEL : Cell Value, String Constant - GBpVef len=0 
' 0018     21 LABEL : Cell Value, String Constant - GCOefB len=0 
' 0018     24 LABEL : Cell Value, String Constant - GnFquUJGz len=0 
' 0018     24 LABEL : Cell Value, String Constant - gnRsdtxzr len=0 
' 0018     20 LABEL : Cell Value, String Constant - GQLnE len=0 
' 0018     20 LABEL : Cell Value, String Constant - hmXQX len=0 
' 0018     20 LABEL : Cell Value, String Constant - HnGrv len=0 
' 0018     22 LABEL : Cell Value, String Constant - iGBegNT len=0 
' 0018     24 LABEL : Cell Value, String Constant - iihmXQXCP len=0 
' 0018     21 LABEL : Cell Value, String Constant - IIjrFg len=0 
' 0018     24 LABEL : Cell Value, String Constant - IZnvwGeYC len=0 
' 0018     23 LABEL : Cell Value, String Constant - jgPcCCdm len=0 
' 0018     21 LABEL : Cell Value, String Constant - JviJfe len=0 
' 0018     29 LABEL : Cell Value, String Constant - kCnrSGDwPMjFdj len=0 
' 0018     22 LABEL : Cell Value, String Constant - kmTZsBp len=0 
' 0018     22 LABEL : Cell Value, String Constant - KPzHOeF len=0 
' 0018     21 LABEL : Cell Value, String Constant - kSUoRW len=0 
' 0018     20 LABEL : Cell Value, String Constant - LaTDl len=0 
' 0018     24 LABEL : Cell Value, String Constant - mjGbzGCOR len=0 
' 0018     21 LABEL : Cell Value, String Constant - mukQLL len=0 
' 0018     21 LABEL : Cell Value, String Constant - mUlXbB len=0 
' 0018     22 LABEL : Cell Value, String Constant - noKMVsZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - nQjPnFfF len=0 
' 0018     20 LABEL : Cell Value, String Constant - nRTzU len=0 
' 0018     21 LABEL : Cell Value, String Constant - OcmVVI len=0 
' 0018     28 LABEL : Cell Value, String Constant - OEuJTCCobDZlz len=0 
' 0018     20 LABEL : Cell Value, String Constant - OocaU len=0 
' 0018     22 LABEL : Cell Value, String Constant - OscYNhX len=0 
' 0018     21 LABEL : Cell Value, String Constant - PyJPLW len=0 
' 0018     24 LABEL : Cell Value, String Constant - QkNSgcLYx len=0 
' 0018     20 LABEL : Cell Value, String Constant - qVtMl len=0 
' 0018     24 LABEL : Cell Value, String Constant - QxzVxCQau len=0 
' 0018     22 LABEL : Cell Value, String Constant - RciepHW len=0 
' 0018     24 LABEL : Cell Value, String Constant - rGefGPbEX len=0 
' 0018     22 LABEL : Cell Value, String Constant - RtYJFsO len=0 
' 0018     23 LABEL : Cell Value, String Constant - ruPrvKUp len=0 
' 0018     23 LABEL : Cell Value, String Constant - SGPmhLNt len=0 
' 0018     23 LABEL : Cell Value, String Constant - SPmIgmiu len=0 
' 0018     20 LABEL : Cell Value, String Constant - sQXeJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - tBfrrILOG len=0 
' 0018     23 LAB
... (truncated)

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