expiro | 3eeb1fe9f42d01fa2162121c8a37f1360af818be5e41cb0a52e7fbe5877b484c

General

Target

JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe
Size

220KB
MD5

f8aa0f8b8dc1527724ba768a89e98798
SHA1

5eb2eb5cc9cb90108b69991c604eb5c4836d549f
SHA256

3eeb1fe9f42d01fa2162121c8a37f1360af818be5e41cb0a52e7fbe5877b484c
SHA512

ac3b0513a2ba9887f7d99c19ba0804ec4c546a8a0424042d648abf24a113c0b4f51bd91955952b77127d95f5063e7bc664e1991199bf830f704a70d5bf25a4ed
SSDEEP

3072:b3S8Iy/aNagTeo6isinQ6ZmQGU0yS+y2Q18mn6FEG57:VRri1z0ySL2Q18A6Ft5

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
behavioral1/memory/2200-13-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/2200-26-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/2136-42-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/2136-43-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/2136-41-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/2136-44-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/2136-48-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2

Executes dropped EXE 2 IoCs

pid	Process
3040	service108.exe
2136	service108.exe

Loads dropped DLL 2 IoCs

pid	Process
2200	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe
2200	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service108.exe"	service108.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service108.exe"	service108.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:	service108.exe
File opened (read-only)	\??\F:	service108.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\\service108.exe"	service108.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\service108.exe	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe
File created	C:\Windows\SysWOW64\service108.exe	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3012 set thread context of 2200	3012	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	30
PID 3040 set thread context of 2136	3040	service108.exe	32

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_f8aa0f8b8dc1527724ba768a89e98798.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service108.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service108.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 3012 wrote to memory of 2200	3012	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	30
PID 3012 wrote to memory of 2200	3012	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	30
PID 3012 wrote to memory of 2200	3012	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	30
PID 3012 wrote to memory of 2200	3012	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	30
PID 3012 wrote to memory of 2200	3012	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	30
PID 3012 wrote to memory of 2200	3012	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	30
PID 3012 wrote to memory of 2200	3012	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	30
PID 3012 wrote to memory of 2200	3012	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	30
PID 2200 wrote to memory of 3040	2200	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	31
PID 2200 wrote to memory of 3040	2200	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	31
PID 2200 wrote to memory of 3040	2200	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	31
PID 2200 wrote to memory of 3040	2200	JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe	31
PID 3040 wrote to memory of 2136	3040	service108.exe	32
PID 3040 wrote to memory of 2136	3040	service108.exe	32
PID 3040 wrote to memory of 2136	3040	service108.exe	32
PID 3040 wrote to memory of 2136	3040	service108.exe	32
PID 3040 wrote to memory of 2136	3040	service108.exe	32
PID 3040 wrote to memory of 2136	3040	service108.exe	32
PID 3040 wrote to memory of 2136	3040	service108.exe	32
PID 3040 wrote to memory of 2136	3040	service108.exe	32

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3012
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f8aa0f8b8dc1527724ba768a89e98798.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2200
- - C:\Windows\SysWOW64\service108.exe
    -n
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3040
  - - C:\Windows\SysWOW64\service108.exe
      -n
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Enumerates connected drives
      Modifies WinLogon
      System Location Discovery: System Language Discovery
      PID:2136

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

\Windows\SysWOW64\service108.exe

Filesize
220KB

MD5
f8aa0f8b8dc1527724ba768a89e98798

SHA1
5eb2eb5cc9cb90108b69991c604eb5c4836d549f

SHA256
3eeb1fe9f42d01fa2162121c8a37f1360af818be5e41cb0a52e7fbe5877b484c

SHA512
ac3b0513a2ba9887f7d99c19ba0804ec4c546a8a0424042d648abf24a113c0b4f51bd91955952b77127d95f5063e7bc664e1991199bf830f704a70d5bf25a4ed

Download Submit
memory/2136-48-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2136-44-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2136-41-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2136-43-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2136-42-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2200-7-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2200-12-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2200-13-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2200-3-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2200-26-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2200-5-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2200-9-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2200-1-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/3012-0-0x0000000000400000-0x000000000044C000-memory.dmp

Filesize
304KB

Download
memory/3012-11-0x0000000000400000-0x000000000044C000-memory.dmp

Filesize
304KB

Download
memory/3040-37-0x0000000000400000-0x000000000044C000-memory.dmp

Filesize
304KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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