Office (OOXML) / .XLSM malware analysis — malicious · eab0e9f38a113071

MALICIOUS

Office (OOXML) / .XLSM

442.7 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000

MD5: 4d0e4799cf175b759436f3411d1ea958 SHA-1: 135553c193ebe80b2898d6b30067dfff30b5485e SHA-256: eab0e9f38a113071c2852f0ed75a3ac4003cda0654b8eb8ba61b9f4f79dc0610

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The XLSM file contains a Workbook_Open macro that is triggered automatically when the document is opened. This macro reconstructs a command string by concatenating environment variables and cell values, then writes this command to a temporary file (likely 'temp.exe' based on the execution command). Finally, it executes this temporary file using 'cmd.exe'. The reconstructed command is 'cmd.exe /c "C:\Users\Public\Documents\temp.exe"', indicating the macro's intent to download and execute a second-stage payload.

Heuristics 5

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_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)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `a1f2b161cc679505b8dab59ef947b6a12358673e6e8d541ebfcce18782642509`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1120 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `d862f7159fb5264d403c7154688a74d0087e3a80318b3c9a5358a4665d90e380`	vba-project	OOXML VBA project: xl/vbaProject.bin	9216 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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