Office (OLE) malware analysis — malicious · 5f9da8134eece8b2

MALICIOUS

Office (OLE)

39.0 KB Created: 2020-04-15 06:58:50 Authoring application: Microsoft Excel

MD5: a2ab06deeee2279099a3138c36901d92 SHA-1: d59a7506323019567a4f9cac0066da6c7d585d0c SHA-256: 5f9da8134eece8b25f6d4da2815d49cc1ea7a5e9d2b18cec549a1ee47010c394

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains both VBA and Excel 4.0 macros, with a critical heuristic indicating that a VBA ActiveX event triggers a decoded Excel 4.0 macro. This macro uses SEND.KEYS to execute a PowerShell command, which is heavily obfuscated and likely downloads a second-stage payload. The presence of PowerShell execution and the ClamAV detection strongly suggest a dropper functionality.

Heuristics 7

VBA ActiveX event launches decoded Excel4 macro critical OLE_VBA_ACTIVEX_XLM_STAGER

The compiled VBA p-code (identifier table) references an auto-firing ActiveX/control event together with ExecuteExcel4Macro, while the decompressed source does not — the VBA-stomping shape of the ActiveX-event XLM stager. The control event bridges into XLM formula execution to call Win32 / drop payloads, hidden from source-level scanners.
ClamAV: Xls.Dropper.Agent-7667955-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-7667955-0
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.
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `820cb8b428caefa499dbdff2fe1d389804ae026ef3c5d9141364f4ba73c78f4f`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3061 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 4 long base64-like blob(s).
`macros.bas` `444a06ec09cc37d1c706f37bcfb855bee159d5dd3aadd474eb18e65e1bcc8657`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	866 bytes

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