Office (OOXML) / .XLSM malware analysis — malicious · d1af73fc3a8feb9a

MALICIOUS

Office (OOXML) / .XLSM

143.3 KB Created: 2020-06-16 12:16:50 UTC Authoring application: Microsoft Excel 16.0300

MD5: e3d5b6b850b1474d52568173b23f7098 SHA-1: d4b7c69cd45fc10ae9d19f48c98ccf00fe320fab SHA-256: d1af73fc3a8feb9a8254eff6a4a94d1637593ade739fc42da2a4907029fa03e2

260 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 sample is a macro-enabled Excel file containing an Auto_Open macro that executes a Base64-decoded command. This command constructs a VBScript file at C:\ProgramData\poc.vbs which downloads a second-stage executable named 1C.exe from the URL https://marketinfosales.com/Quen/1C.exe. The use of Auto_Open and Shell() calls indicates a malicious intent to download and execute arbitrary code.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA Base64-decoded Shell command stager critical OLE_VBA_BASE64_SHELL_COMMAND_STAGER

VBA auto-exec macro decodes Base64 string literals into command or script-launch text and executes the result with Shell. This catches cmd/cscript/PowerShell/VBS launchers hidden from plain keyword matching.

URL https://marketinfosales.com/Quen/1C.exe
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d02377c7f6e8a58cdbb62cd4d01ad543edb85cd76bedea0b3e0f51845199749f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3557 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `fc9686ea79bd935e18fd67e3bf0ddac850305cb0d9da8b6759f507fb1006a18a`	vba-project	OOXML VBA project: xl/vbaProject.bin	19456 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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