expiro | e0842d5a6de5e1a5c8924e338598468d2de7d976d636c9ebf04bc8001b5c9faf

Analysis

max time kernel
144s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
11/12/2024, 02:45

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General

Target
df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe
Size 60KB
Sample241211-c8rnbsxjdn
SHA256 e0842d5a6de5e1a5c8924e338598468d2de7d976d636c9ebf04bc8001b5c9faf
MD5 df9623834c4b66446eeafe6daa381921
SHA1 f7f291918b22a5413f50dd021c8098a60086d742
SHA512 4cc16052971f555a03cd6a04e0529843e2490f009fedd5d0e2d5200f322cba2b9f41e76abc4d1cef3f98c57d17cb4e59c62b3081d26bc578e1336d1188296a6d
SSDEEP 768:LE30e/7tEaWcArSwaydTb0EroSd3QXGsBS4sZFFSUv6GfEK+RsWW2qTN4lvCy2ZL:k+PeXonnUStQXDI4spvVp+N8NECtH3T
MD5 SHA1 SHA512 SSDEEP

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 5 IoCs

backdoor

resource	yara_rule
behavioral2/memory/4688-5-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4688-10-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/1808-19-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/1808-20-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/1808-22-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2

Executes dropped EXE 2 IoCs

pid	Process
3124	service116.exe
1808	service116.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-1-5-21-3227495264-2217614367-4027411560-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service116.exe"	service116.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service116.exe"	service116.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:	service116.exe
File opened (read-only)	\??\F:	service116.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\\service116.exe"	service116.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\service116.exe	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe
File opened for modification	C:\Windows\SysWOW64\service116.exe	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3296 set thread context of 4688	3296	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	82
PID 3124 set thread context of 1808	3124	service116.exe	84

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	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service116.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service116.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 3296 wrote to memory of 4688	3296	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	82
PID 3296 wrote to memory of 4688	3296	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	82
PID 3296 wrote to memory of 4688	3296	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	82
PID 3296 wrote to memory of 4688	3296	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	82
PID 3296 wrote to memory of 4688	3296	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	82
PID 3296 wrote to memory of 4688	3296	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	82
PID 3296 wrote to memory of 4688	3296	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	82
PID 4688 wrote to memory of 3124	4688	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	83
PID 4688 wrote to memory of 3124	4688	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	83
PID 4688 wrote to memory of 3124	4688	df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe	83
PID 3124 wrote to memory of 1808	3124	service116.exe	84
PID 3124 wrote to memory of 1808	3124	service116.exe	84
PID 3124 wrote to memory of 1808	3124	service116.exe	84
PID 3124 wrote to memory of 1808	3124	service116.exe	84
PID 3124 wrote to memory of 1808	3124	service116.exe	84
PID 3124 wrote to memory of 1808	3124	service116.exe	84
PID 3124 wrote to memory of 1808	3124	service116.exe	84

C:\Users\Admin\AppData\Local\Temp\df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3296
- C:\Users\Admin\AppData\Local\Temp\df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\df9623834c4b66446eeafe6daa381921_JaffaCakes118.exe"
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4688
- - C:\Windows\SysWOW64\service116.exe
    -n
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3124
  - - C:\Windows\SysWOW64\service116.exe
      -n
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Enumerates connected drives
      Modifies WinLogon
      System Location Discovery: System Language Discovery
      PID:1808

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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service116.exe

Path C:\Windows\SysWOW64\service116.exe
Size 60KB
SHA256 e0842d5a6de5e1a5c8924e338598468d2de7d976d636c9ebf04bc8001b5c9faf
MD5 df9623834c4b66446eeafe6daa381921
SHA1 f7f291918b22a5413f50dd021c8098a60086d742
SHA512 4cc16052971f555a03cd6a04e0529843e2490f009fedd5d0e2d5200f322cba2b9f41e76abc4d1cef3f98c57d17cb4e59c62b3081d26bc578e1336d1188296a6d
SSDEEP 768:LE30e/7tEaWcArSwaydTb0EroSd3QXGsBS4sZFFSUv6GfEK+RsWW2qTN4lvCy2ZL:k+PeXonnUStQXDI4spvVp+N8NECtH3T
MD5 SHA1 SHA512 SSDEEP

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memory/1808-18-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/1808-19-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/1808-20-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/1808-22-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/3124-17-0x0000000000400000-0x0000000000423000-memory.dmp

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memory/3296-0-0x0000000000400000-0x0000000000423000-memory.dmp

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memory/3296-4-0x0000000000400000-0x0000000000423000-memory.dmp

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memory/4688-1-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/4688-3-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/4688-5-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/4688-10-0x0000000000400000-0x000000000040B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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