Office (OOXML) / .XLSM malware analysis — malicious · 4a0fbe1fc7794aa9

MALICIOUS

Office (OOXML) / .XLSM

42.0 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: f6034a52fec1d276f66ba286e5743321 SHA-1: d89ecfffb7c698efb73e99c60e25b8d4b7ad0122 SHA-256: 4a0fbe1fc7794aa9b204276270235ee8a09ed3764a37edbc55f9ddf726d1fc82

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This XLSM file contains a Workbook_Open macro that references PowerShell and cmd.exe, and uses WMI to launch processes. The macro also contains obfuscated Base64 decoding logic, suggesting it is designed to download and execute a second-stage payload. The presence of these execution-related heuristics and the embedded VBA macro code strongly indicate a malicious intent for payload delivery.

Heuristics 7

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE

VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `07ad497690bca9e5d2f1e4d5b0364043efaa638c3c033ffbcdfa5a7a72dea1f8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35911 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `45715bdde76bb10ae6bbb78e21afc643f0f5bf5e913d8ccd3403aec033999dce`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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