expiro | 57f6aba00d0b3c2aece91d894f6f5031a1c8f63aa08eef5f26a4d8bda801c916

General

Target

JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe
Size

96KB
MD5

1aead11bef75d68d66f2d133e7ac65c1
SHA1

b8764d0d71980f10aa49c2b2431a5ad08d457ece
SHA256

57f6aba00d0b3c2aece91d894f6f5031a1c8f63aa08eef5f26a4d8bda801c916
SHA512

fea8718b8c7610de4a24b7449386f57fb4d5f6205262744651e68b85863b5cc4f562575d143677c3fcd94d3c36e5fe34535340d9adb840dc1fd16b9168604f94
SSDEEP

768:LXzlX7m2PX2uC3P1UtKzlJsEqDlEVBRDKwsB9nMZnANQ1N/4U7rYxamg46MVp:LD02PX2uCUtT9DlkBRDPsBcs0WpgX6

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 9 IoCs

backdoor

resource	yara_rule
behavioral2/memory/4932-5-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4932-10-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4508-19-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4508-21-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4508-20-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4508-22-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4508-28-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4508-31-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4508-33-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2

Executes dropped EXE 2 IoCs

pid	Process
4524	service140.exe
4508	service140.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\\service140.exe"	service140.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service140.exe"	service140.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:	service140.exe
File opened (read-only)	\??\F:	service140.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\\service140.exe"	service140.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\service140.exe	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe
File created	C:\Windows\SysWOW64\service140.exe	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3196 set thread context of 4932	3196	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	86
PID 4524 set thread context of 4508	4524	service140.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_1aead11bef75d68d66f2d133e7ac65c1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service140.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service140.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 3196 wrote to memory of 4932	3196	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	86
PID 3196 wrote to memory of 4932	3196	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	86
PID 3196 wrote to memory of 4932	3196	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	86
PID 3196 wrote to memory of 4932	3196	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	86
PID 3196 wrote to memory of 4932	3196	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	86
PID 3196 wrote to memory of 4932	3196	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	86
PID 3196 wrote to memory of 4932	3196	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	86
PID 4932 wrote to memory of 4524	4932	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	87
PID 4932 wrote to memory of 4524	4932	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	87
PID 4932 wrote to memory of 4524	4932	JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe	87
PID 4524 wrote to memory of 4508	4524	service140.exe	93
PID 4524 wrote to memory of 4508	4524	service140.exe	93
PID 4524 wrote to memory of 4508	4524	service140.exe	93
PID 4524 wrote to memory of 4508	4524	service140.exe	93
PID 4524 wrote to memory of 4508	4524	service140.exe	93
PID 4524 wrote to memory of 4508	4524	service140.exe	93
PID 4524 wrote to memory of 4508	4524	service140.exe	93

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3196
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_1aead11bef75d68d66f2d133e7ac65c1.exe"
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4932
- - C:\Windows\SysWOW64\service140.exe
    -n
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4524
  - - C:\Windows\SysWOW64\service140.exe
      -n
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Enumerates connected drives
      Modifies WinLogon
      System Location Discovery: System Language Discovery
      PID:4508

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\service140.exe

Filesize
96KB

MD5
1aead11bef75d68d66f2d133e7ac65c1

SHA1
b8764d0d71980f10aa49c2b2431a5ad08d457ece

SHA256
57f6aba00d0b3c2aece91d894f6f5031a1c8f63aa08eef5f26a4d8bda801c916

SHA512
fea8718b8c7610de4a24b7449386f57fb4d5f6205262744651e68b85863b5cc4f562575d143677c3fcd94d3c36e5fe34535340d9adb840dc1fd16b9168604f94

Download Submit
memory/3196-0-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/3196-3-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/4508-22-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4508-18-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4508-19-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4508-21-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4508-20-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4508-28-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4508-31-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4508-33-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4524-16-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/4932-5-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4932-4-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4932-10-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/4932-1-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads