expiro | 596397cadce5ecdb769d02c7df256867b0e51becc34469df0cc70572f34716bf

General

Target

JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe
Size

60KB
MD5

b7f370b70ab5371c554c8bca0783ba7c
SHA1

94a031951b19b7e5a8459dec49da99877e33c744
SHA256

596397cadce5ecdb769d02c7df256867b0e51becc34469df0cc70572f34716bf
SHA512

1e3504c3b41aafeba0dcea470a8cb93ec3685813b953f0468828db94f6aabfa4fa967e0cb849fe7e5a855145e5af32fddc6d9921e3ee158de0096737ff74b935
SSDEEP

768:FE30e/7tEaWcArSwaydTb0EroSd3QXGsBS4sZFFSUv6GfEK+RsWW2qTN4lvCy2ZL:S+PeXonnUStQXDI4spvVp+N8NECtH3T

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 8 IoCs

backdoor

resource	yara_rule
behavioral1/memory/2208-5-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/2208-9-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/4756-20-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/4756-21-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/4756-23-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/4756-27-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/4756-28-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral1/memory/4756-35-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2

Executes dropped EXE 2 IoCs

pid	Process
1584	service227.exe
4756	service227.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-1-5-21-1279544337-3716153908-718418795-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service227.exe"	service227.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service227.exe"	service227.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:	service227.exe
File opened (read-only)	\??\F:	service227.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\\service227.exe"	service227.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\service227.exe	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe
File created	C:\Windows\SysWOW64\service227.exe	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5980 set thread context of 2208	5980	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	87
PID 1584 set thread context of 4756	1584	service227.exe	93

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_b7f370b70ab5371c554c8bca0783ba7c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service227.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service227.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 5980 wrote to memory of 2208	5980	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	87
PID 5980 wrote to memory of 2208	5980	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	87
PID 5980 wrote to memory of 2208	5980	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	87
PID 5980 wrote to memory of 2208	5980	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	87
PID 5980 wrote to memory of 2208	5980	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	87
PID 5980 wrote to memory of 2208	5980	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	87
PID 5980 wrote to memory of 2208	5980	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	87
PID 2208 wrote to memory of 1584	2208	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	88
PID 2208 wrote to memory of 1584	2208	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	88
PID 2208 wrote to memory of 1584	2208	JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe	88
PID 1584 wrote to memory of 4756	1584	service227.exe	93
PID 1584 wrote to memory of 4756	1584	service227.exe	93
PID 1584 wrote to memory of 4756	1584	service227.exe	93
PID 1584 wrote to memory of 4756	1584	service227.exe	93
PID 1584 wrote to memory of 4756	1584	service227.exe	93
PID 1584 wrote to memory of 4756	1584	service227.exe	93
PID 1584 wrote to memory of 4756	1584	service227.exe	93

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5980
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b7f370b70ab5371c554c8bca0783ba7c.exe"
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2208
- - C:\Windows\SysWOW64\service227.exe
    -n
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1584
  - - C:\Windows\SysWOW64\service227.exe
      -n
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Enumerates connected drives
      Modifies WinLogon
      System Location Discovery: System Language Discovery
      PID:4756

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Windows\SysWOW64\service227.exe
1⤵
PID:1056

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Windows\SysWOW64\service227.exe
1⤵
PID:5732

Network

MITRE ATT&CK Enterprise v16

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\service227.exe

Filesize
60KB

MD5
b7f370b70ab5371c554c8bca0783ba7c

SHA1
94a031951b19b7e5a8459dec49da99877e33c744

SHA256
596397cadce5ecdb769d02c7df256867b0e51becc34469df0cc70572f34716bf

SHA512
1e3504c3b41aafeba0dcea470a8cb93ec3685813b953f0468828db94f6aabfa4fa967e0cb849fe7e5a855145e5af32fddc6d9921e3ee158de0096737ff74b935

Download Submit
memory/1584-16-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/2208-1-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2208-3-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2208-5-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2208-9-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4756-20-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4756-18-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4756-21-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4756-23-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4756-27-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4756-28-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4756-35-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/5980-4-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download
memory/5980-0-0x0000000000400000-0x0000000000423000-memory.dmp

Filesize
140KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads