expiro | 1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc

General

Target

1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe
Size

68KB
MD5

140fa1e170e2cb9a86995c09c1fa020e
SHA1

55859f24dae9b67a2246e4e95a77bdac34ef95fa
SHA256

1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc
SHA512

43156b782bedc426e86dd96bb090cc1bb8c4c9eef570043f85112afca8bbea840c60d267fcc7eae98f82cb3537cf182ac2ace01a659e29b866782d2e847765ad
SSDEEP

768:jXzpX7m2PX2uC3P1UtKzlJsEqDlEVBRDKwsB9nMZnANQ1N/4U7rYxamg46MVpo:jDI2PX2uCUtT9DlkBRDPsBcs0WpgX6O

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/2700-5-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2700-9-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2436-21-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2436-22-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2436-20-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2436-23-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/2436-27-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2

Executes dropped EXE 2 IoCs

pid	Process
2036	service188.exe
2436	service188.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-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service188.exe"	service188.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service188.exe"	service188.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:	service188.exe
File opened (read-only)	\??\F:	service188.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\\service188.exe"	service188.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\service188.exe	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe
File created	C:\Windows\SysWOW64\service188.exe	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1828 set thread context of 2700	1828	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	85
PID 2036 set thread context of 2436	2036	service188.exe	87

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	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service188.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service188.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 1828 wrote to memory of 2700	1828	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	85
PID 1828 wrote to memory of 2700	1828	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	85
PID 1828 wrote to memory of 2700	1828	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	85
PID 1828 wrote to memory of 2700	1828	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	85
PID 1828 wrote to memory of 2700	1828	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	85
PID 1828 wrote to memory of 2700	1828	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	85
PID 1828 wrote to memory of 2700	1828	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	85
PID 2700 wrote to memory of 2036	2700	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	86
PID 2700 wrote to memory of 2036	2700	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	86
PID 2700 wrote to memory of 2036	2700	1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe	86
PID 2036 wrote to memory of 2436	2036	service188.exe	87
PID 2036 wrote to memory of 2436	2036	service188.exe	87
PID 2036 wrote to memory of 2436	2036	service188.exe	87
PID 2036 wrote to memory of 2436	2036	service188.exe	87
PID 2036 wrote to memory of 2436	2036	service188.exe	87
PID 2036 wrote to memory of 2436	2036	service188.exe	87
PID 2036 wrote to memory of 2436	2036	service188.exe	87

C:\Users\Admin\AppData\Local\Temp\1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe
"C:\Users\Admin\AppData\Local\Temp\1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1828
- C:\Users\Admin\AppData\Local\Temp\1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe
  "C:\Users\Admin\AppData\Local\Temp\1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc.exe"
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2700
- - C:\Windows\SysWOW64\service188.exe
    -n
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2036
  - - C:\Windows\SysWOW64\service188.exe
      -n
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Enumerates connected drives
      Modifies WinLogon
      System Location Discovery: System Language Discovery
      PID:2436

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\service188.exe

Filesize
68KB

MD5
140fa1e170e2cb9a86995c09c1fa020e

SHA1
55859f24dae9b67a2246e4e95a77bdac34ef95fa

SHA256
1761d64dd37c90f67aebb7c2f17e32a918a552803b18001cb5f28d7ada8697fc

SHA512
43156b782bedc426e86dd96bb090cc1bb8c4c9eef570043f85112afca8bbea840c60d267fcc7eae98f82cb3537cf182ac2ace01a659e29b866782d2e847765ad

Download Submit
memory/1828-3-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/1828-0-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2036-17-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2436-22-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2436-27-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2436-23-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2436-20-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2436-21-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2700-4-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2700-9-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2700-5-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2700-1-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads