Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 78cccda3099c88d8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:54 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: b458a1a175cb32593b76b68cdb01b844 SHA-1: 9e0428c77a0af94e0cc395e09a5d0421c1580e88 SHA-256: 78cccda3099c88d8f59cf5163f20053694a39bec353149aa88467954e7b4af94
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. This functionality is commonly used to download and execute further malicious payloads, making it a high-risk artifact.

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) 6607 bytes
SHA-256: da1a1ef60717f809d30af1b0d8ad49a74e0d47fc4f15535acbcd92779fef9c17
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 -  KcugQApFC
' 0018     20 LABEL : Cell Value, String Constant - adift len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B170 
' 0018     21 LABEL : Cell Value, String Constant - BwFLRv len=0 
' 0018     21 LABEL : Cell Value, String Constant - DXYPJR len=0 
' 0018     27 LABEL : Cell Value, String Constant - HfdVpJVrXKNj len=0 
' 0018     22 LABEL : Cell Value, String Constant - HKoJInZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - ikVZxR len=0 
' 0018     20 LABEL : Cell Value, String Constant - jEDjw len=0 
' 0018     24 LABEL : Cell Value, String Constant - kpHMuxsrk len=0 
' 0018     20 LABEL : Cell Value, String Constant - ksKbw len=0 
' 0018     26 LABEL : Cell Value, String Constant - kxGNAuXSaZq len=0 
' 0018     27 LABEL : Cell Value, String Constant - LaTPdOdrfjaN len=0 
' 0018     27 LABEL : Cell Value, String Constant - lZWpkPKbtRgt len=0 
' 0018     25 LABEL : Cell Value, String Constant - PQzCwKbOki len=0 
' 0018     22 LABEL : Cell Value, String Constant - qCZBFmg len=0 
' 0018     23 LABEL : Cell Value, String Constant - QZAYKhLD len=0 
' 0018     20 LABEL : Cell Value, String Constant - vkUzF len=0 
' 0018     24 LABEL : Cell Value, String Constant - wqJeZsmNX len=0 
' 0018     20 LABEL : Cell Value, String Constant - WVsUB len=0 
' 0018     24 LABEL : Cell Value, String Constant - yZtckhFDI len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZDMwQo 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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