expiro | 9c8f5e529aec8cbc4d2c1237a84d9ffd95b5bcb7cce8249ad13ba85aa2afc3cc

General

Target

JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe
Size

241KB
MD5

a66ee35d04b3f125d479a450d6a3adc3
SHA1

ceb743d8f8e901304899192c18b96f5a23098055
SHA256

9c8f5e529aec8cbc4d2c1237a84d9ffd95b5bcb7cce8249ad13ba85aa2afc3cc
SHA512

24543f5a0197c8d3baff0ac3e05770440633805df23a22304d2d43f6062e840c9d47b4784690ffc2c6bda9b125f091212385c34271e782352cb6eab28b28574e
SSDEEP

3072:L3S8Iy/aNagTeo6isinQ6ZmQGU0yS+y2Q18mn6FEG57rEi7ri:FRri1z0ySL2Q18A6Ft5ci3i

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/4016-5-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4016-9-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2536-22-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2536-21-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2536-20-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2536-23-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2536-26-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2

Executes dropped EXE 2 IoCs

pid	Process
4996	service103.exe
2536	service103.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-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service103.exe"	service103.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service103.exe"	service103.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:	service103.exe
File opened (read-only)	\??\D:	service103.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\\service103.exe"	service103.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\service103.exe	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe
File created	C:\Windows\SysWOW64\service103.exe	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4928 set thread context of 4016	4928	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	83
PID 4996 set thread context of 2536	4996	service103.exe	85

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	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service103.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service103.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 4928 wrote to memory of 4016	4928	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	83
PID 4928 wrote to memory of 4016	4928	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	83
PID 4928 wrote to memory of 4016	4928	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	83
PID 4928 wrote to memory of 4016	4928	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	83
PID 4928 wrote to memory of 4016	4928	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	83
PID 4928 wrote to memory of 4016	4928	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	83
PID 4928 wrote to memory of 4016	4928	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	83
PID 4016 wrote to memory of 4996	4016	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	84
PID 4016 wrote to memory of 4996	4016	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	84
PID 4016 wrote to memory of 4996	4016	JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe	84
PID 4996 wrote to memory of 2536	4996	service103.exe	85
PID 4996 wrote to memory of 2536	4996	service103.exe	85
PID 4996 wrote to memory of 2536	4996	service103.exe	85
PID 4996 wrote to memory of 2536	4996	service103.exe	85
PID 4996 wrote to memory of 2536	4996	service103.exe	85
PID 4996 wrote to memory of 2536	4996	service103.exe	85
PID 4996 wrote to memory of 2536	4996	service103.exe	85

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4928
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a66ee35d04b3f125d479a450d6a3adc3.exe"
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4016
- - C:\Windows\SysWOW64\service103.exe
    -n
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4996
  - - C:\Windows\SysWOW64\service103.exe
      -n
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Enumerates connected drives
      Modifies WinLogon
      System Location Discovery: System Language Discovery
      PID:2536

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\service103.exe

Filesize
241KB

MD5
a66ee35d04b3f125d479a450d6a3adc3

SHA1
ceb743d8f8e901304899192c18b96f5a23098055

SHA256
9c8f5e529aec8cbc4d2c1237a84d9ffd95b5bcb7cce8249ad13ba85aa2afc3cc

SHA512
24543f5a0197c8d3baff0ac3e05770440633805df23a22304d2d43f6062e840c9d47b4784690ffc2c6bda9b125f091212385c34271e782352cb6eab28b28574e

Download Submit
memory/2536-18-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2536-26-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2536-23-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2536-20-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2536-21-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2536-22-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4016-4-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4016-9-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4016-5-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4016-1-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4928-0-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/4928-3-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/4996-17-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads