Office (OOXML) / .XLSM malware analysis — malicious · e3dacfe903996e17

MALICIOUS

Office (OOXML) / .XLSM

39.1 KB Created: 2022-04-14 16:56:05 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-04-20

MD5: 018702674eb276dfee214e1bfe5c986b SHA-1: 10083a24c5792f1b94195735ae3b9357601c186a SHA-256: e3dacfe903996e17272145222ddf82ae88fe02ddef2fcaf7d7c6e3d4b834bb42

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an XLSM file containing VBA macros. The Auto_Open macro is present and utilizes WScript.Shell and CreateObject to execute commands. Specifically, it uses the URLDownloadToFile API to download a file from a URL, which is a common technique for delivering second-stage payloads. The document body itself is a lure, instructing the user to 'ENABLE CONTENT ABOVE TO SUBMIT FORM' to bypass macro security.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile 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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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` `4359e7170b148711c4ada0bbd2f12feb870c18b60e8044aa410997c3aae2208a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	4123 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` `273b831e14304530e9fba8e0b3a9a37defd676cb0686fcf87db132395ea135d0`	vba-project	OOXML VBA project: xl/vbaProject.bin	29696 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.

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