Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7e4de5aa9325ff74…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:28 Authoring application: Microsoft Excel First seen: 2021-09-29
MD5: e8b0885d94b98fb141cdce6d822b3241 SHA-1: b8b027e95b6e7b6fed54101ccb38f7648b830fc2 SHA-256: 7e4de5aa9325ff74a4e7dd210fd68846ef259f6334430c2d9ec75ec0e15d6ca6
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs within the macro sheet suggests an intent to execute arbitrary code, likely to download and run a secondary payload. No specific family could be identified from the available evidence.

Heuristics 3

  • 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.

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) 6612 bytes
SHA-256: 705fe618cc048dfb8ac9720a3ca3a68e7713cd7d2ff7d8c3e9fd163e4321c77d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  FeOnN
' 0018     23 LABEL : Cell Value, String Constant - aiorGUvk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B158 
' 0018     21 LABEL : Cell Value, String Constant - cfgJOV len=0 
' 0018     21 LABEL : Cell Value, String Constant - dfarkr len=0 
' 0018     21 LABEL : Cell Value, String Constant - EChQJf len=0 
' 0018     20 LABEL : Cell Value, String Constant - EFWwL len=0 
' 0018     21 LABEL : Cell Value, String Constant - HBAAUS len=0 
' 0018     23 LABEL : Cell Value, String Constant - hpoZsVaw len=0 
' 0018     22 LABEL : Cell Value, String Constant - jnsUAHw len=0 
' 0018     25 LABEL : Cell Value, String Constant - JPjfUXiqqK len=0 
' 0018     24 LABEL : Cell Value, String Constant - JPJIZnXSe len=0 
' 0018     23 LABEL : Cell Value, String Constant - mGOrXBIV len=0 
' 0018     21 LABEL : Cell Value, String Constant - mMsunR len=0 
' 0018     22 LABEL : Cell Value, String Constant - pERwopl len=0 
' 0018     22 LABEL : Cell Value, String Constant - QXczqsC len=0 
' 0018     27 LABEL : Cell Value, String Constant - ReqFiohuwUah len=0 
' 0018     27 LABEL : Cell Value, String Constant - RnhJCHrCNkeK len=0 
' 0018     22 LABEL : Cell Value, String Constant - SmMPqpi len=0 
' 0018     20 LABEL : Cell Value, String Constant - UJOMq len=0 
' 0018     22 LABEL : Cell Value, String Constant - yBsqzMD len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZeDbm len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Valu
... (truncated)

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