Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 03a80f3b63605866…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:46:06 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 0a1964d6b221006790d4364cdd18d3eb SHA-1: bd2c223a115c80a10e32d42c755909b664320fba SHA-256: 03a80f3b636058660d519f7156bda559304484e2d87a6ee52e054530d3b168b8
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, specifically using dangerous functions like RUN. This strongly suggests the macro is designed to execute arbitrary code upon opening the document. The macro sheet itself contains obfuscated data, likely to conceal the actual payload or execution commands.

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) 6546 bytes
SHA-256: 42ae1db4992194884e06f8efec699d832a56156877b490c813760e29deca8be5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  kIHFwVMEs
' 0018     20 LABEL : Cell Value, String Constant - AuGPf len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C192 
' 0018     22 LABEL : Cell Value, String Constant - cdICBGu len=0 
' 0018     22 LABEL : Cell Value, String Constant - dKzXqac len=0 
' 0018     21 LABEL : Cell Value, String Constant - dQqeHC len=0 
' 0018     21 LABEL : Cell Value, String Constant - eRsqoU len=0 
' 0018     26 LABEL : Cell Value, String Constant - EZDOGNLLMjC len=0 
' 0018     24 LABEL : Cell Value, String Constant - GgxuThrjR len=0 
' 0018     20 LABEL : Cell Value, String Constant - jYxoj len=0 
' 0018     25 LABEL : Cell Value, String Constant - LSQWNYjsbn len=0 
' 0018     22 LABEL : Cell Value, String Constant - PWxudQa len=0 
' 0018     22 LABEL : Cell Value, String Constant - PxgfsdA len=0 
' 0018     26 LABEL : Cell Value, String Constant - QrVoepdokfu len=0 
' 0018     26 LABEL : Cell Value, String Constant - RXXKzOpKKWr len=0 
' 0018     23 LABEL : Cell Value, String Constant - SVAOsWDq len=0 
' 0018     23 LABEL : Cell Value, String Constant - tFKqnrAq len=0 
' 0018     20 LABEL : Cell Value, String Constant - TRhiZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - UedCkhEf len=0 
' 0018     22 LABEL : Cell Value, String Constant - uLeoztp len=0 
' 0018     23 LABEL : Cell Value, String Constant - uxjKTXRR len=0 
' 0018     24 LABEL : Cell Value, String Constant - wDnzipolA 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
... (truncated)

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