Office (OLE) / .XLS malware analysis — malicious · f695adbe8668cdef

MALICIOUS

Office (OLE) / .XLS

90.2 KB Created: 2022-01-27 23:33:44 Authoring application: Microsoft Excel

MD5: 3f397d9cca325167d86d575896d40207 SHA-1: 54b8106c1715eb58230371fa033cbdec1e3aaeff SHA-256: f695adbe8668cdef7b307bc0fc89a664d8002b42dc91b8a01a75aec4cfc9018c

322 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Service Execution: Service Control T1204.002 Malicious File: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical indicator of malicious intent. This macro executes a command that leverages mshta to download and execute a payload from the URL http://91.240.118.172/ee/ss/se.html. The presence of the 'Doc.Downloader.EmotetRed02220-9938645-0' ClamAV detection further supports its classification as a downloader. The execution of this command is the primary malicious action observed.

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.
ClamAV: Doc.Downloader.EmotetRed02220-9938645-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938645-0
Reference to mshta.exe high SC_STR_MSHTA

Reference to mshta.exe
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://91.240.118.172/ee/ss/se.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `712daaadef5bb5a097700650c710c5cfa82b295835e03515a82f90167f9f4c8e`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	540 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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