Office (OLE) / .XLS malware analysis — malicious · be39c6fe075f44db

MALICIOUS

Office (OLE) / .XLS

846.0 KB Created: 2019-10-22 07:10:34 Authoring application: Microsoft Excel

MD5: c13d1c99603e1116ec8c7ea04454926b SHA-1: bfc2aa8f1de4f92e756062df3a595d0a657bfaf0 SHA-256: be39c6fe075f44db1bcee46b6c5f49ef477d1977594d659d388e12f97bff2cbb

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical indicator of malicious intent. The macro attempts to execute PowerShell commands, including a command that concatenates strings to form a download operation. This PowerShell command is designed to download and execute a second-stage payload from a remote URL. The presence of 'bitsadmin' and 'cmd.exe' further supports the payload delivery mechanism.

Heuristics 8

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.
Suspicious cmd.exe invocation with execution flag high SC_STR_CMD

Suspicious cmd.exe invocation with execution flag
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
Reference to bitsadmin (download) high SC_STR_BITSADMIN

Reference to bitsadmin (download)
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` `f663df2d1cbbf5f9a5eb524770e39d034dffdb3432267325c96fed5301141629`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1907 bytes
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.

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