Office (OLE) / .XLS malware analysis — malicious · c584d4691284d390

MALICIOUS

Office (OLE) / .XLS

118.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel

MD5: 93819018eb34f8c5e4a2385f2bb5d592 SHA-1: 9236b6a515c3b810086636d9bd3f6c5b7da9efc7 SHA-256: c584d4691284d390817aa3f810f2aa707bacd890ff6df97175a72c8337090655

400 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The critical heuristics OLE_VBA_SHELL, OLE_VBA_WSCRIPT, and OLE_VBA_OBFUSCATED_SHELL_URL indicate that the VBA macros within this XLS file are designed to execute arbitrary commands. Specifically, the Workbook_Open macro is triggered upon opening, and it uses WScript.Shell to download and run a payload from the provided URL, which is a common technique for initial access and malware delivery.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL

VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.

URL http://scaladevelopments.scaladevco.com/17/po8703.ex
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `438abb9d20c3b3768d53f01e9d5d37f92d6c1905870c39cdd5347758ecac2f71`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1138 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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