Office (OLE) / .XLS malware analysis — malicious · 1ec119e53f86134b

MALICIOUS

Office (OLE) / .XLS

732.5 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel

MD5: 7f0653f9d8522e91185b01060dafae80 SHA-1: a68217d80d88c794faf39d465dd27812862e8e19 SHA-256: 1ec119e53f86134b6552c4852656ba5c8bf048fd1b83f2f80e7cc63af6c4b7c9

400 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLS file containing VBA macros, including a Workbook_Open macro that uses the Shell() function. This macro is designed to execute an embedded PE executable, identified as 'embedded_office_00006265.exe'. The presence of VirtualAlloc, LoadLibrary, and GetProcAddress API calls within the VBA code suggests dynamic loading and execution of malicious code. The primary intent is to download and execute a second-stage payload from the embedded executable.

Heuristics 11

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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.
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
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://www.w3.org/2000/svg
- http://www.w3.org/1999/xlink

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d1aa2a243c52b5f3cfb95ee4d01e16823458e708f72c84eb52dd2fe38f0bdef8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	10578 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`embedded_office_00006265.exe` `5c575707730458d440784be5f04a757e646f8100361d941235c4df33198c3d5d`	embedded-pe	Office MZ+PE at offset 0x6265	724891 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ole10native_00.bin` `6a7ddfbd62d7b14acf0191ff71596164ed9e322382a63f3f68d56cb2c2a68d56`	ole-package	OLE Ole10Native stream: MBD00AAB60E/Ole10Native	612007 bytes

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