Office (OOXML) / .XLSM malware analysis — malicious · e2440efec182d0f4

MALICIOUS

Office (OOXML) / .XLSM

149.7 KB Created: 2021-01-28 00:55:11 UTC Authoring application: Microsoft Excel 15.0300

MD5: 6340b1742de326d9a43a3dac37d34289 SHA-1: 29a6db0a937317df23ccc4270e65270c52f1f53e SHA-256: e2440efec182d0f4cd5fefbcd3d614b2c79b61d42f88a09b25306c9f96898453

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML file contains a Workbook_Open macro that utilizes WScript.Shell and CreateObject to execute arbitrary commands. This macro is designed to download and execute a second-stage payload, indicating a downloader or initial access stage of an attack. The presence of Shell() and WScript.Shell usage strongly suggests malicious intent.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
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` `2d45980a5d8cd2934d0421116f32d7db1eb07c9372c81a3f5e266c7a2aa01ed2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1500 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` `5ba0d90d3978a28861d8af87bae60c5fe3e0967286f14c844e7c56d73e8d71d3`	vba-project	OOXML VBA project: xl/vbaProject.bin	16384 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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