Office (OOXML) / .XLSM malware analysis — malicious · da0c905ab56f598c

MALICIOUS

Office (OOXML) / .XLSM

411.8 KB Created: 2020-06-02 07:32:09 UTC Authoring application: Microsoft Excel 16.0300

MD5: 189e06080fe992c703693f9bb359e79c SHA-1: 6c2da0e0d56ded5a60a730b73d594daad2589df4 SHA-256: da0c905ab56f598c50573495085657b80b76557d12f9416fd4a4a96632a000e1

380 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLSM file containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. Heuristics indicate the use of Shell() and WScript.Shell, suggesting the macro attempts to download and execute a second-stage payload. ClamAV detections further support its malicious nature as a downloader. The specific malware family could not be confidently identified.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
ClamAV: Xls.Downloader.DridexGreen09213-9890103-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.DridexGreen09213-9890103-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `ccf3b51dbd150564663228e8e21ce227413c269f4eecac198e6e89bda6d22bb2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3456 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` `f2f337cf6d461122deca7b0ed451851446104226a1b9a7b3120e3e68609ed646`	vba-project	OOXML VBA project: xl/vbaProject.bin	17920 bytes
Detection ClamAV: Xls.Malware.Sload-7135989-0 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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