expiro | 1cfbb05a5fd1642e93be994783e5979e5e2bd3a61448accf7e0a572b708aaa1b

Analysis

max time kernel
145s
max time network
140s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
18/07/2024, 04:13

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General

Target
561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe
Size 60KB
Sample240718-eterbsvclq
SHA256 1cfbb05a5fd1642e93be994783e5979e5e2bd3a61448accf7e0a572b708aaa1b
MD5 561a099e88ab448c35548fe60f5305b2
SHA1 623eb68af3354846f7bed24d1bb04ef50ecd7279
SHA512 ec9b5882f6678acc6948739355d5c25f8a42827308d195c8418d9a5c8dd9e5e516de5725319dcc2f88bdc9308c4956cb9c7c7ae885badfa01b2a50e138283c82
SSDEEP 768:7E30e/7tEaWcArSwaydTb0EroSd3QXGsBS4sZFFSUv6GfEK+RsWW2qTN4lvCy2ZL:U+PeXonnUStQXDI4spvVp+N8NECtH3T
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

expiro backdoor persistence

Malware Config

Signatures

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/4452-5-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4452-6-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/4452-10-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/688-20-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/688-21-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/688-23-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2
behavioral2/memory/688-36-0x0000000000400000-0x000000000040B000-memory.dmp	family_expiro2

Executes dropped EXE 2 IoCs

pid	Process
4992	service221.exe
688	service221.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-1-5-21-701583114-2636601053-947405450-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service221.exe"	service221.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service221.exe"	service221.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:	service221.exe
File opened (read-only)	\??\F:	service221.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\\service221.exe"	service221.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\service221.exe	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe
File created	C:\Windows\SysWOW64\service221.exe	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4004 set thread context of 4452	4004	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	89
PID 4992 set thread context of 688	4992	service221.exe	93

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 4004 wrote to memory of 4452	4004	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	89
PID 4004 wrote to memory of 4452	4004	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	89
PID 4004 wrote to memory of 4452	4004	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	89
PID 4004 wrote to memory of 4452	4004	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	89
PID 4004 wrote to memory of 4452	4004	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	89
PID 4004 wrote to memory of 4452	4004	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	89
PID 4004 wrote to memory of 4452	4004	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	89
PID 4452 wrote to memory of 4992	4452	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	90
PID 4452 wrote to memory of 4992	4452	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	90
PID 4452 wrote to memory of 4992	4452	561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe	90
PID 4992 wrote to memory of 688	4992	service221.exe	93
PID 4992 wrote to memory of 688	4992	service221.exe	93
PID 4992 wrote to memory of 688	4992	service221.exe	93
PID 4992 wrote to memory of 688	4992	service221.exe	93
PID 4992 wrote to memory of 688	4992	service221.exe	93
PID 4992 wrote to memory of 688	4992	service221.exe	93
PID 4992 wrote to memory of 688	4992	service221.exe	93

C:\Users\Admin\AppData\Local\Temp\561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4004
- C:\Users\Admin\AppData\Local\Temp\561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\561a099e88ab448c35548fe60f5305b2_JaffaCakes118.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:4452
- - C:\Windows\SysWOW64\service221.exe
    -n
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:4992
  - - C:\Windows\SysWOW64\service221.exe
      -n
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Enumerates connected drives
      Modifies WinLogon
      PID:688

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

service221.exe

Path C:\Windows\SysWOW64\service221.exe
Size 60KB
SHA256 1cfbb05a5fd1642e93be994783e5979e5e2bd3a61448accf7e0a572b708aaa1b
MD5 561a099e88ab448c35548fe60f5305b2
SHA1 623eb68af3354846f7bed24d1bb04ef50ecd7279
SHA512 ec9b5882f6678acc6948739355d5c25f8a42827308d195c8418d9a5c8dd9e5e516de5725319dcc2f88bdc9308c4956cb9c7c7ae885badfa01b2a50e138283c82
SSDEEP 768:7E30e/7tEaWcArSwaydTb0EroSd3QXGsBS4sZFFSUv6GfEK+RsWW2qTN4lvCy2ZL:U+PeXonnUStQXDI4spvVp+N8NECtH3T
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/688-19-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/688-36-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/688-23-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/688-21-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/688-20-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/4004-3-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4004-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4452-4-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/4452-10-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/4452-6-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/4452-5-0x0000000000400000-0x000000000040B000-memory.dmp

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memory/4452-1-0x0000000000400000-0x000000000040B000-memory.dmp

Download

memory/4992-17-0x0000000000400000-0x0000000000417000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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