Yolk[.]exe | Triage

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General

Target

Yolk.exe
Size

614KB
MD5

dc5a44ef4eb172240cdc8caf46c3b914
SHA1

e547ee256a1f4617959b1f1d0f7119b67d673793
SHA256

02287bb15e2cdc4638209d969bd8b88693e47c6fa30fddb6039adaf649bfb4ad
SHA512

77a5e75929f6f9bc2c14343d827ab0394b7d8bb46cec6760c96390cc3ae36a75d030b3d790ec5ae5b038fa7713a51fed6c23882589f8ac0d7f521bbdea251eb4
SSDEEP

12288:M4mjiqrwQ5hiqPwKfCs0mduQmhbefpMCTLwAQz5UTN9ELRVOwPwilZMc/3:sTfuqPw8CsTmReh3FQ1C6LRVOHilZMcv

Score

3^/10

Malware Config

Signatures

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
unpack001/$PLUGINSDIR/System.dll

Files

Yolk.exe
.exe windows:4 windows x86 arch:x86

e2a592076b17ef8bfb48b7e03965a3fc

Code Sign

2b:f9:4d:00:af:70:a8:54:51:8d:4b:98:58:7f:2d:9a:27:dc:75:6f
Certificate

Issuer

CN=Agrammatism,OU=Shiitter Varmebehandlers\ ,O=Agrammatism,L=Châteaubriant,ST=Pays de la Loire,C=FR,1.2.840.113549.1.9.1=#0c17537a696c617264404c65756b6f6379746f7469632e416c

Not Before

19-06-2023 01:58

Not After

18-06-2026 01:58

Subject

CN=Agrammatism,OU=Shiitter Varmebehandlers\ ,O=Agrammatism,L=Châteaubriant,ST=Pays de la Loire,C=FR,1.2.840.113549.1.9.1=#0c17537a696c617264404c65756b6f6379746f7469632e416c

41:1e:86:bb:cc:72:58:98
Certificate

Issuer

CN=Apple Timestamp Certification Authority,OU=Apple Certification Authority,O=Apple Inc.,C=US

Not Before

19-02-2024 20:25

Not After

01-04-2024 20:25

Subject

CN=Timestamp Signer MA2,O=Apple Inc.,C=US

Extended Key Usages

ExtKeyUsageTimeStamping

Key Usages

KeyUsageDigitalSignature

7d:4c:57:63:9f:f3:f0:b7
Certificate

Issuer

CN=Apple Root CA,OU=Apple Certification Authority,O=Apple Inc.,C=US

Not Before

05-04-2012 12:02

Not After

05-04-2027 12:02

Subject

CN=Apple Timestamp Certification Authority,OU=Apple Certification Authority,O=Apple Inc.,C=US

Key Usages

KeyUsageDigitalSignature
KeyUsageCertSign
KeyUsageCRLSign

02
Certificate

Issuer

CN=Apple Root CA,OU=Apple Certification Authority,O=Apple Inc.,C=US

Not Before

25-04-2006 21:40

Not After

09-02-2035 21:40

Subject

CN=Apple Root CA,OU=Apple Certification Authority,O=Apple Inc.,C=US

Key Usages

KeyUsageCertSign
KeyUsageCRLSign

43:2e:1f:3f:85:92:53:e2:29:7f:92:2a:6f:c2:db:fa:30:c9:ca:95:d8:3c:9c:1d:1b:5a:d6:bc:02:2c:b9:f3
Signer

Actual PE Digest

43:2e:1f:3f:85:92:53:e2:29:7f:92:2a:6f:c2:db:fa:30:c9:ca:95:d8:3c:9c:1d:1b:5a:d6:bc:02:2c:b9:f3

Digest Algorithm

sha256

PE Digest Matches

true

Headers

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_NO_SEH
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE

File Characteristics

IMAGE_FILE_RELOCS_STRIPPED
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LINE_NUMS_STRIPPED
IMAGE_FILE_LOCAL_SYMS_STRIPPED
IMAGE_FILE_32BIT_MACHINE

Imports

kernel32

SetCurrentDirectoryW
GetFileAttributesW
GetFullPathNameW
Sleep
GetTickCount
GetFileSize
GetModuleFileNameW
MoveFileW
SetFileAttributesW
GetCurrentProcess
ExitProcess
SetEnvironmentVariableW
GetWindowsDirectoryW
GetTempPathW
GetCommandLineW
GetVersion
SetErrorMode
lstrlenW
WaitForSingleObject
CopyFileW
CompareFileTime
GlobalLock
CreateThread
GetLastError
CreateDirectoryW
CreateProcessW
RemoveDirectoryW
lstrcmpiA
CreateFileW
GetTempFileNameW
WriteFile
lstrcpyA
lstrcpyW
MoveFileExW
lstrcatW
GetSystemDirectoryW
GetProcAddress
GetModuleHandleA
GlobalFree
GlobalAlloc
GetShortPathNameW
SearchPathW
lstrcmpiW
SetFileTime
CloseHandle
ExpandEnvironmentStringsW
lstrcmpW
GlobalUnlock
lstrcpynW
GetDiskFreeSpaceW
GetExitCodeProcess
FindFirstFileW
FindNextFileW
DeleteFileW
SetFilePointer
ReadFile
FindClose
MulDiv
MultiByteToWideChar
lstrlenA
WideCharToMultiByte
GetPrivateProfileStringW
WritePrivateProfileStringW
FreeLibrary
LoadLibraryExW
GetModuleHandleW

user32

GetSystemMenu
SetClassLongW
IsWindowEnabled
EnableMenuItem
SetWindowPos
GetSysColor
GetWindowLongW
SetCursor
LoadCursorW
CheckDlgButton
GetMessagePos
LoadBitmapW
CallWindowProcW
IsWindowVisible
CloseClipboard
SetClipboardData
EmptyClipboard
OpenClipboard
wsprintfW
ScreenToClient
GetWindowRect
GetSystemMetrics
SetDlgItemTextW
GetDlgItemTextW
MessageBoxIndirectW
CharPrevW
CharNextA
wsprintfA
DispatchMessageW
PeekMessageW
GetDC
ReleaseDC
EnableWindow
InvalidateRect
SendMessageW
DefWindowProcW
BeginPaint
GetClientRect
FillRect
EndDialog
RegisterClassW
SystemParametersInfoW
CreateWindowExW
GetClassInfoW
DialogBoxParamW
CharNextW
ExitWindowsEx
DestroyWindow
LoadImageW
SetTimer
SetWindowTextW
PostQuitMessage
ShowWindow
GetDlgItem
IsWindow
SetWindowLongW
FindWindowExW
TrackPopupMenu
AppendMenuW
CreatePopupMenu
DrawTextW
EndPaint
CreateDialogParamW
SendMessageTimeoutW
SetForegroundWindow

gdi32

SelectObject
SetBkMode
CreateFontIndirectW
SetTextColor
DeleteObject
GetDeviceCaps
CreateBrushIndirect
SetBkColor

shell32

SHGetSpecialFolderLocation
SHGetPathFromIDListW
SHBrowseForFolderW
SHGetFileInfoW
ShellExecuteW
SHFileOperationW

advapi32

RegDeleteKeyW
SetFileSecurityW
OpenProcessToken
LookupPrivilegeValueW
AdjustTokenPrivileges
RegOpenKeyExW
RegEnumValueW
RegDeleteValueW
RegCloseKey
RegCreateKeyExW
RegSetValueExW
RegQueryValueExW
RegEnumKeyW

comctl32

ImageList_AddMasked
ord17
ImageList_Destroy
ImageList_Create

ole32

OleUninitialize
OleInitialize
CoTaskMemFree
CoCreateInstance

Sections

.text
Size: 25KB - Virtual size: 24KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 5KB - Virtual size: 5KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 1KB - Virtual size: 171KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.ndata
Size: - Virtual size: 400KB

IMAGE_SCN_CNT_UNINITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.rsrc
Size: 162KB - Virtual size: 162KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
$PLUGINSDIR/System.dll
.dll windows:4 windows x86 arch:x86

fc0224e99e736751432961db63a41b76

Headers

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LINE_NUMS_STRIPPED
IMAGE_FILE_LOCAL_SYMS_STRIPPED
IMAGE_FILE_32BIT_MACHINE
IMAGE_FILE_DLL

Imports

kernel32

GetModuleHandleW
GlobalFree
GlobalSize
lstrcpynW
lstrcpyW
GetProcAddress
WideCharToMultiByte
VirtualFree
FreeLibrary
lstrlenW
LoadLibraryW
GlobalAlloc
MultiByteToWideChar
VirtualAlloc
VirtualProtect
GetLastError

user32

wsprintfW

ole32

StringFromGUID2
CLSIDFromString

Exports

Exports

Alloc
Call
Copy
Free
Get
Int64Op
Store
StrAlloc

Sections

.text
Size: 8KB - Virtual size: 7KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 1024B - Virtual size: 851B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 512B - Virtual size: 120B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.reloc
Size: 1024B - Virtual size: 610B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
Mainmortable/Programnavne/Lewdness36/Skrabs5/oenologist.toa
Mainmortable/Programnavne/Lewdness36/Skrabs5/pigsticked.txt
Mainmortable/Programnavne/Lewdness36/Skrabs5/revnernes.sub
Rataksels/Hyoplastron/Perforates/Humoristic/Fannys.Fly
Svingkarrusellerne/Skrtorsdagens/Tylets/Accessorily.Bol
Svingkarrusellerne/Skrtorsdagens/Tylets/Immutation.tri

Sharing

General

Malware Config

Signatures

Files

e2a592076b17ef8bfb48b7e03965a3fc

Code Sign

2b:f9:4d:00:af:70:a8:54:51:8d:4b:98:58:7f:2d:9a:27:dc:75:6fCertificate

41:1e:86:bb:cc:72:58:98Certificate

Extended Key Usages

Key Usages

7d:4c:57:63:9f:f3:f0:b7Certificate

Key Usages

02Certificate

Key Usages

43:2e:1f:3f:85:92:53:e2:29:7f:92:2a:6f:c2:db:fa:30:c9:ca:95:d8:3c:9c:1d:1b:5a:d6:bc:02:2c:b9:f3Signer

Headers

DLL Characteristics

File Characteristics

Imports

kernel32

user32

gdi32

shell32

advapi32

comctl32

ole32

Sections

.text Size: 25KB - Virtual size: 24KB

.rdata Size: 5KB - Virtual size: 5KB

.data Size: 1KB - Virtual size: 171KB

.ndata Size: - Virtual size: 400KB

.rsrc Size: 162KB - Virtual size: 162KB

fc0224e99e736751432961db63a41b76

Headers

File Characteristics

Imports

kernel32

user32

ole32

Exports

Exports

Sections

.text Size: 8KB - Virtual size: 7KB

.rdata Size: 1024B - Virtual size: 851B

.data Size: 512B - Virtual size: 120B

.reloc Size: 1024B - Virtual size: 610B

2b:f9:4d:00:af:70:a8:54:51:8d:4b:98:58:7f:2d:9a:27:dc:75:6f
Certificate

41:1e:86:bb:cc:72:58:98
Certificate

7d:4c:57:63:9f:f3:f0:b7
Certificate

02
Certificate

43:2e:1f:3f:85:92:53:e2:29:7f:92:2a:6f:c2:db:fa:30:c9:ca:95:d8:3c:9c:1d:1b:5a:d6:bc:02:2c:b9:f3
Signer

.text
Size: 25KB - Virtual size: 24KB

.rdata
Size: 5KB - Virtual size: 5KB

.data
Size: 1KB - Virtual size: 171KB

.ndata
Size: - Virtual size: 400KB

.rsrc
Size: 162KB - Virtual size: 162KB

.text
Size: 8KB - Virtual size: 7KB

.rdata
Size: 1024B - Virtual size: 851B

.data
Size: 512B - Virtual size: 120B

.reloc
Size: 1024B - Virtual size: 610B