Office (OOXML) / .XLSM malware analysis — malicious · 5a0a5d5dba05830f

MALICIOUS

Office (OOXML) / .XLSM

391.9 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300

MD5: 96e74ac8392e3a599cb3643849d309e7 SHA-1: 8cb1e89f58cc5a9d9ea25fc7e34724ecc76452cd SHA-256: 5a0a5d5dba05830ff1f30cecd4420ec2c2a71bc2e7b5a20becd9a783670557d6

112 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1140 Deobfuscate or Obfuscate

The sample is an XLSM file containing VBA macros. The Workbook_Activate subroutine contains a Base64 encoded string which decodes to a PowerShell command. This command is designed to download a second-stage executable from 'http://saipab.in/ConsoleApp6.exe' and execute it. The script also creates a batch file named 'hytnpcdsyvqqsssvrrkpgye.bat' to launch the PowerShell command. The presence of a macro-enable lure and the execution of a downloaded payload are strong indicators of a malicious document.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
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
External hyperlinks (4) low OOXML_EXTERNAL_HYPERLINKS

Document contains 4 external hyperlinks — clickable URLs are stored as external relationships. First target: https://go.microsoft.com/fwlink/?linkid=844732
Suspicious extracted artifact info 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.
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 https://go.microsoft.com/fwlink/?linkid=844732
- https://go.microsoft.com/fwlink/?linkid=844741
- https://go.microsoft.com/fwlink/?linkid=844736
- https://go.microsoft.com/fwlink/?linkid=844747
- https://go.microsoft.com/fwlink/?linkid=844746
- https://go.microsoft.com/fwlink/?linkid=844728
- https://go.microsoft.com/fwlink/?linkid=844735
- https://go.microsoft.com/fwlink/?linkid=844725
- https://go.microsoft.com/fwlink/?linkid=844738
- https://go.microsoft.com/fwlink/?linkid=844749
- http://go.microsoft.com/fwlink/?LinkId=846285
- https://go.microsoft.com/fwlink/?linkid=844745
- https://go.microsoft.com/fwlink/?linkid=844751
- https://go.microsoft.com/fwlink/?linkid=844743
- https://go.microsoft.com/fwlink/?linkid=844750
- https://go.microsoft.com/fwlink/?linkid=844726
- https://go.microsoft.com/fwlink/?linkid=844742
- https://go.microsoft.com/fwlink/?linkid=844734
- http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `72b271737d57acd18e76164aef1a4b496a5e2c1e23dabb425bae4c7cd4d613dd`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5522 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`vbaProject_00.bin` `ee41040051446b448acb3b2fd6423a18dd82c6219d0bee44e4eaf924845bc123`	vba-project	OOXML VBA project: xl/vbaProject.bin	10752 bytes

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