expiro | 3e07e45517bf9208d84828670ff629fd49886e88d8aad36f5398d50a9145339d

General

Target

JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe
Size

136KB
MD5

9a0fef5bacd78141f5b157e61421b9ca
SHA1

07333c948933d5db063caaa954dfb08ea9c1a481
SHA256

3e07e45517bf9208d84828670ff629fd49886e88d8aad36f5398d50a9145339d
SHA512

56d10642a3083701f25cd053351d793bb80ecbe8cdfd90260dcbf88ad6e051e680122fa8c31ffd0a6d9cc9a89f292f6f3de725bee1601a5d88ea277a1e26cf19
SSDEEP

3072:8FgnUStM0BFn+N8FcUDbIzu9wrBzm5YaxE3vm40cjENDe:8FAs0H68KMIqOlzEYlO40cjb

Score

10^/10

expiro backdoor discovery persistence

Malware Config

Signatures

Expiro family
expiro
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/2680-3-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2680-7-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2808-17-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2808-16-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2808-19-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2808-22-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2808-23-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2

Executes dropped EXE 2 IoCs

pid	Process
2656	service169.exe
2808	service169.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-1-5-21-1121399784-3202166597-3503557106-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service169.exe"	service169.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service169.exe"	service169.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)	\??\F:	service169.exe
File opened (read-only)	\??\D:	service169.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\\service169.exe"	service169.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\service169.exe	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe
File created	C:\Windows\SysWOW64\service169.exe	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4756 set thread context of 2680	4756	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	89
PID 2656 set thread context of 2808	2656	service169.exe	91

System Location Discovery: System Language Discovery 1 TTPs 4 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	service169.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service169.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 4756 wrote to memory of 2680	4756	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	89
PID 4756 wrote to memory of 2680	4756	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	89
PID 4756 wrote to memory of 2680	4756	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	89
PID 4756 wrote to memory of 2680	4756	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	89
PID 4756 wrote to memory of 2680	4756	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	89
PID 4756 wrote to memory of 2680	4756	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	89
PID 4756 wrote to memory of 2680	4756	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	89
PID 2680 wrote to memory of 2656	2680	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	90
PID 2680 wrote to memory of 2656	2680	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	90
PID 2680 wrote to memory of 2656	2680	JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe	90
PID 2656 wrote to memory of 2808	2656	service169.exe	91
PID 2656 wrote to memory of 2808	2656	service169.exe	91
PID 2656 wrote to memory of 2808	2656	service169.exe	91
PID 2656 wrote to memory of 2808	2656	service169.exe	91
PID 2656 wrote to memory of 2808	2656	service169.exe	91
PID 2656 wrote to memory of 2808	2656	service169.exe	91
PID 2656 wrote to memory of 2808	2656	service169.exe	91

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4756
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_9a0fef5bacd78141f5b157e61421b9ca.exe"
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2680
- - C:\Windows\SysWOW64\service169.exe
    -n
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2656
  - - C:\Windows\SysWOW64\service169.exe
      -n
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Enumerates connected drives
      Modifies WinLogon
      System Location Discovery: System Language Discovery
      PID:2808

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\SysWOW64\service169.exe

Filesize
136KB

MD5
9a0fef5bacd78141f5b157e61421b9ca

SHA1
07333c948933d5db063caaa954dfb08ea9c1a481

SHA256
3e07e45517bf9208d84828670ff629fd49886e88d8aad36f5398d50a9145339d

SHA512
56d10642a3083701f25cd053351d793bb80ecbe8cdfd90260dcbf88ad6e051e680122fa8c31ffd0a6d9cc9a89f292f6f3de725bee1601a5d88ea277a1e26cf19

Download Submit
memory/2680-0-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2680-2-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2680-3-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2680-7-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2808-15-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2808-17-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2808-16-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2808-19-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2808-22-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2808-23-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads