expiro | 36bba2998433ee043a2bc8e08b3b40fa5baed04d89912f8706f2a62bae7fa260

Analysis

max time kernel
145s
max time network
130s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
15/07/2024, 22:31

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General

Target
4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe
Size 165KB
Sample240715-2fbtvavene
SHA256 36bba2998433ee043a2bc8e08b3b40fa5baed04d89912f8706f2a62bae7fa260
MD5 4baf807e0a45c6cb7114dbc83a8d4a6d
SHA1 6db6674eec84e60beb3004abc52f9c316c122464
SHA512 bc97e68e5e793b89d76a7281a0bd184f7bf6ab7ccb41937925f6c1fd1023f2c4b5ccd5652e96d72f7e72698907d760dca73e5c8f7172998cfc6db8d9e17b49dd
SSDEEP 3072:ryJLYzYSyupMfJGvC4FJMRTOriMG3Xel9pWCvS722I91mcDSOpa9ZvhJq9Spesjw:eVYMSnpMfJGvCW0TsiMGHSPWCvN2y4kV
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

expiro backdoor persistence

Malware Config

Signatures

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

Expiro payload 7 IoCs

backdoor

resource	yara_rule
behavioral2/memory/744-5-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/744-9-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/1260-20-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/1260-22-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/1260-21-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/1260-23-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/1260-35-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2

Executes dropped EXE 2 IoCs

pid	Process
1888	service132.exe
1260	service132.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3419463127-3903270268-2580331543-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service132.exe"	service132.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service132.exe"	service132.exe

Enumerates connected drives 3 TTPs 2 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\D:	service132.exe
File opened (read-only)	\??\F:	service132.exe

Modifies WinLogon 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service132.exe"	service132.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\service132.exe	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe
File created	C:\Windows\SysWOW64\service132.exe	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2472 set thread context of 744	2472	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	86
PID 1888 set thread context of 1260	1888	service132.exe	88

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 2472 wrote to memory of 744	2472	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	86
PID 2472 wrote to memory of 744	2472	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	86
PID 2472 wrote to memory of 744	2472	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	86
PID 2472 wrote to memory of 744	2472	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	86
PID 2472 wrote to memory of 744	2472	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	86
PID 2472 wrote to memory of 744	2472	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	86
PID 2472 wrote to memory of 744	2472	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	86
PID 744 wrote to memory of 1888	744	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	87
PID 744 wrote to memory of 1888	744	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	87
PID 744 wrote to memory of 1888	744	4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe	87
PID 1888 wrote to memory of 1260	1888	service132.exe	88
PID 1888 wrote to memory of 1260	1888	service132.exe	88
PID 1888 wrote to memory of 1260	1888	service132.exe	88
PID 1888 wrote to memory of 1260	1888	service132.exe	88
PID 1888 wrote to memory of 1260	1888	service132.exe	88
PID 1888 wrote to memory of 1260	1888	service132.exe	88
PID 1888 wrote to memory of 1260	1888	service132.exe	88

C:\Users\Admin\AppData\Local\Temp\4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2472
- C:\Users\Admin\AppData\Local\Temp\4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\4baf807e0a45c6cb7114dbc83a8d4a6d_JaffaCakes118.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:744
- - C:\Windows\SysWOW64\service132.exe
    -n
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1888
  - - C:\Windows\SysWOW64\service132.exe
      -n
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Enumerates connected drives
      Modifies WinLogon
      PID:1260

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

service132.exe

Path C:\Windows\SysWOW64\service132.exe
Size 165KB
SHA256 36bba2998433ee043a2bc8e08b3b40fa5baed04d89912f8706f2a62bae7fa260
MD5 4baf807e0a45c6cb7114dbc83a8d4a6d
SHA1 6db6674eec84e60beb3004abc52f9c316c122464
SHA512 bc97e68e5e793b89d76a7281a0bd184f7bf6ab7ccb41937925f6c1fd1023f2c4b5ccd5652e96d72f7e72698907d760dca73e5c8f7172998cfc6db8d9e17b49dd
SSDEEP 3072:ryJLYzYSyupMfJGvC4FJMRTOriMG3Xel9pWCvS722I91mcDSOpa9ZvhJq9Spesjw:eVYMSnpMfJGvCW0TsiMGHSPWCvN2y4kV
MD5 SHA1 SHA512 SSDEEP

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memory/744-3-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/744-9-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/744-1-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/744-5-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/1260-22-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/1260-19-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/1260-20-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/1260-21-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/1260-23-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/1260-35-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/1888-14-0x0000000000400000-0x000000000042D000-memory.dmp

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memory/1888-17-0x0000000000400000-0x000000000042D000-memory.dmp

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memory/2472-0-0x0000000000400000-0x000000000042D000-memory.dmp

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memory/2472-4-0x0000000000400000-0x000000000042D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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