Office (OOXML) / .XLSM malware analysis — malicious · 2b0f5546b026f1b9

MALICIOUS

Office (OOXML) / .XLSM

224.0 KB Created: 2026-01-27 07:26:24 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2026-04-14

MD5: f24c172e17d3f3c06013410b4f31114f SHA-1: 85dccdbcc7f503aa6bdc5564e526587664471108 SHA-256: 2b0f5546b026f1b961571048572b0b9ec5adb52442746c96e9bf787a2bb7ec5d

450 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLSM file containing a VBA macro that executes upon opening. The macro uses WScript.Shell to download an executable from the URL https://explssts.serveusers.com/downloads/2/CHE265028A.exe and save it to the user's temporary directory as CHE265028A(1).exe. It then executes the downloaded file. This behavior is indicative of a dropper malware.

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://explssts.serveusers.com/downloads/2/CHE265028A.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d817c997ae38fff9f934d6119244113631f291a2f48169542855da83e33482a0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1469 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` `72a0d35f3568e2dd0f68d6124d4e417fd5527a2b2e4cacaa1ac606c126499f2a`	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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