Office (OOXML) / .XLSM malware analysis — malicious · c6d1092e3f39218b

MALICIOUS

Office (OOXML) / .XLSM

224.0 KB Created: 2026-01-27 07:26:24 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2026-02-27

MD5: 07a34555a9f59b5e61c76638af5887f8 SHA-1: f78cce107efb6c60c04de026fe80e2265ce3ee17 SHA-256: c6d1092e3f39218baf167992afbe020d713b47483e87b64f20dd43a35efe2903

450 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The Auto_Open macro within the XLSM file utilizes WScript.Shell and CreateObject to download a file from 'https://uploads.otzo.com/1D/a5c1D.exe' and save it to the temporary directory as '%TEMP%\a5c1D(N).exe'. The script then executes the downloaded file, indicating a dropper functionality. The presence of obfuscated shell commands and the confirmed ClamAV detection further support its malicious nature.

Heuristics 11

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL

VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
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 https://uploads.otzo.com/1D/a5c1D.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `fa4ec4f4ade5c3fd558f4676a23b437bc24bf44bc794630b73de251cc14d1e58`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1442 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.
`vbaProject_00.bin` `6a67f56744adbf9f3d156716ac5933b0aa00b472298f22042ba964c5d4b6a251`	vba-project	OOXML VBA project: xl/vbaProject.bin	14848 bytes
Detection ClamAV: Doc.Dropper.Agent-6412232-1 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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