expiro | 24a0d73a194b3ad3f22e4fb1de1d5f27597ab7dfc8e79089760739509a6c4513

Analysis

max time kernel
16s
max time network
20s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
04-01-2025 22:31

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General

Target

JaffaCakes118_7c7112065f4022dd47ef69e39ba2caf0.exe
Size

607KB
MD5

7c7112065f4022dd47ef69e39ba2caf0
SHA1

09cc3c987aade05e1004adea1af7c5b287951b37
SHA256

24a0d73a194b3ad3f22e4fb1de1d5f27597ab7dfc8e79089760739509a6c4513
SHA512

d4c5eaa061101c71486c736dd1f8d0960765b7e5a80242b932aa9ce2bed4c711ae2c68ab008e176f9ec580e26d0b767e10e1f9d2c666e2c97473baf7b933f1a0
SSDEEP

12288:JBwmc9bj45zYAekJWIHSEGYOhrOH2HyFWrkHzR9cQCIHFU8//OZH:0mcaJXeWWIHSlhjHycgHzRNHFB

Score

10^/10

expiro backdoor discovery

Malware Config

Signatures

Expiro family
expiro
Expiro, m0yv
Expiro aka m0yv is a multi-functional backdoor written in C++.
backdoor expiro

Expiro payload 1 IoCs

backdoor

resource	yara_rule
behavioral1/memory/2468-2-0x0000000001000000-0x0000000001262000-memory.dmp	family_expiro1

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_7c7112065f4022dd47ef69e39ba2caf0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Nls\Language	csrss.exe

Enumerates system info in registry 2 TTPs 32 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\2	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\SYSTEM\MultifunctionAdapter\0\KeyboardController\0\KeyboardPeripheral	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\SYSTEM\MultifunctionAdapter\0\KeyboardController\0\KeyboardPeripheral\0	csrss.exe
Key queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\2	csrss.exe
Key queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\KeyboardController\0\KeyboardPeripheral	csrss.exe
Key enumerated	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\1	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\1\Identifier	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\SYSTEM\MultifunctionAdapter\0\KeyboardController\0	csrss.exe
Key enumerated	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\Component Information	csrss.exe
Key queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\KeyboardController\0\KeyboardPeripheral\0\Component Information	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\SYSTEM\MultifunctionAdapter\0\KeyboardController	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\KeyboardController\0\Identifier	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\Configuration Data	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\SYSTEM\MultifunctionAdapter\1\KeyboardController	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\2\Component Information	csrss.exe
Key queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\1	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\2\Identifier	csrss.exe
Key queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\KeyboardController	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\KeyboardController\0\Configuration Data	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\KeyboardController\0\Component Information	csrss.exe
Key queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\Identifier	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\1\Configuration Data	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\KeyboardController\0\KeyboardPeripheral\0\Identifier	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0\KeyboardController\0\KeyboardPeripheral\0\Configuration Data	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\0	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\1\Component Information	csrss.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\MultifunctionAdapter\2\Configuration Data	csrss.exe

Modifies data under HKEY_USERS 9 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\ThemeManager\LastUserLangID = "1033"	winlogon.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\ThemeManager\LastLoadedDPI = "96"	winlogon.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\ThemeManager\DllName = "%SystemRoot%\\resources\\themes\\Aero\\Aero.msstyles"	winlogon.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\ThemeManager\SizeName = "NormalSize"	winlogon.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Desktop\MuiCached\MachinePreferredUILanguages = 65006e002d00550053000000	winlogon.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\ThemeManager	winlogon.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\ThemeManager\ThemeActive = "1"	winlogon.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\ThemeManager\LoadedBefore = "1"	winlogon.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\ThemeManager\ColorName = "NormalColor"	winlogon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeShutdownPrivilege	2940	LogonUI.exe
Token: SeShutdownPrivilege	2940	LogonUI.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 2588 wrote to memory of 2940	2588	csrss.exe	32
PID 2588 wrote to memory of 2940	2588	csrss.exe	32
PID 2232 wrote to memory of 2940	2232	winlogon.exe	32
PID 2232 wrote to memory of 2940	2232	winlogon.exe	32
PID 2232 wrote to memory of 2940	2232	winlogon.exe	32
PID 2588 wrote to memory of 2940	2588	csrss.exe	32
PID 2588 wrote to memory of 2940	2588	csrss.exe	32
PID 2588 wrote to memory of 2940	2588	csrss.exe	32
PID 2588 wrote to memory of 2940	2588	csrss.exe	32
PID 2588 wrote to memory of 2940	2588	csrss.exe	32
PID 2588 wrote to memory of 2940	2588	csrss.exe	32
PID 2588 wrote to memory of 2940	2588	csrss.exe	32
PID 2588 wrote to memory of 2940	2588	csrss.exe	32

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7c7112065f4022dd47ef69e39ba2caf0.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7c7112065f4022dd47ef69e39ba2caf0.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:2468

C:\Windows\system32\csrss.exe
%SystemRoot%\system32\csrss.exe ObjectDirectory=\Windows SharedSection=1024,20480,768 Windows=On SubSystemType=Windows ServerDll=basesrv,1 ServerDll=winsrv:UserServerDllInitialization,3 ServerDll=winsrv:ConServerDllInitialization,2 ServerDll=sxssrv,4 ProfileControl=Off MaxRequestThreads=16
1⤵
- System Location Discovery: System Language Discovery
- Enumerates system info in registry
- Suspicious use of WriteProcessMemory
PID:2588

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of WriteProcessMemory
PID:2232
- C:\Windows\system32\LogonUI.exe
  "LogonUI.exe" /flags:0x0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2940

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2468-0-0x0000000001000000-0x0000000001262000-memory.dmp

Filesize
2.4MB

Download
memory/2468-1-0x0000000001003000-0x0000000001004000-memory.dmp

Filesize
4KB

Download
memory/2468-2-0x0000000001000000-0x0000000001262000-memory.dmp

Filesize
2.4MB

Download
memory/2940-3-0x0000000002AB0000-0x0000000002AB1000-memory.dmp

Filesize
4KB

Download
memory/2940-4-0x0000000002AB0000-0x0000000002AB1000-memory.dmp

Filesize
4KB

Download