Office (OOXML) / .XLSX malware analysis — malicious · 94738831b96adc9c

MALICIOUS

Office (OOXML) / .XLSX

74.7 KB Created: 2020-12-28 23:32:28 UTC Authoring application: Microsoft Excel 2.6

MD5: 8e7768bcb6fe1259267737675eefcb4a SHA-1: 2430149047d6851963743a69a44a5d0f2370c193 SHA-256: 94738831b96adc9cbfaf16771441533dfefed4dac66e84610ad41828cfadf1b5

388 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1218 Signed Binary Proxy Execution

The sample is an Excel file containing VBA macros. The Auto_Open macro is present and uses Shell() and WScript.Shell to execute commands, including PowerShell, indicating a downloader or executioner. The document body attempts to socially engineer the user into enabling macros by displaying a fake error and calendar. The VBA macros are designed to download and execute a second-stage payload.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin reference in VBA
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)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `ec6f218124a19312c012420cd58675d1816f5593af88eb4a5d85ecc7d9ff2dcc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2260 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `fe9fbbbe5fa2cd5d5b0c6651eeed3e57664f076f02a859453f708fa4f99911dd`	vba-project	OOXML VBA project: xl/vbaProject.bin	18944 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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