expiro | 19bdba4c02f3e286b2d7047e76e25aad356748edcec95e37634face159894eb2

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 20:34

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General

Target

JaffaCakes118_bc4fdfc216dbd521f810b8305e38637a.exe
Size

417KB
MD5

bc4fdfc216dbd521f810b8305e38637a
SHA1

69abe447bae71e7a0b481f922de4b6161fb8989d
SHA256

19bdba4c02f3e286b2d7047e76e25aad356748edcec95e37634face159894eb2
SHA512

1d301bd8087402b829152c984440d0e684a504ce3f09772e2ddb998d2e2881041485674650146328776c2ab09bcfe2359fcc119c9184c3e5996da4dcd296f395
SSDEEP

6144:HSpwTEOzPSK5U2SoJ8VWackFV1ZmXRWLgKocUq8nOfaIROo71YvK09lw+45B:y+IK5U2SoysGmwLQcUqgsPBYv745B

Score

10^/10

expiro backdoor discovery

Malware Config

Signatures

Expiro family
expiro
Expiro, m0yv
Expiro aka m0yv is a multi-functional backdoor written in C++.
backdoor expiro

Expiro payload 4 IoCs

backdoor

resource	yara_rule
behavioral1/memory/3020-0-0x000000000019C000-0x000000000022F000-memory.dmp	family_expiro1
behavioral1/memory/3020-1-0x0000000000130000-0x000000000022F000-memory.dmp	family_expiro1
behavioral1/memory/3020-2-0x000000000019C000-0x000000000022F000-memory.dmp	family_expiro1
behavioral1/memory/3020-3-0x0000000000130000-0x000000000022F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2668	3020	WerFault.exe	29

System Location Discovery: System Language Discovery 1 TTPs 1 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_bc4fdfc216dbd521f810b8305e38637a.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3020 wrote to memory of 2668	3020	JaffaCakes118_bc4fdfc216dbd521f810b8305e38637a.exe	30
PID 3020 wrote to memory of 2668	3020	JaffaCakes118_bc4fdfc216dbd521f810b8305e38637a.exe	30
PID 3020 wrote to memory of 2668	3020	JaffaCakes118_bc4fdfc216dbd521f810b8305e38637a.exe	30
PID 3020 wrote to memory of 2668	3020	JaffaCakes118_bc4fdfc216dbd521f810b8305e38637a.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_bc4fdfc216dbd521f810b8305e38637a.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_bc4fdfc216dbd521f810b8305e38637a.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3020
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3020 -s 68
  2⤵
  - Program crash
  PID:2668

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/3020-0-0x000000000019C000-0x000000000022F000-memory.dmp

Filesize
588KB

Download
memory/3020-1-0x0000000000130000-0x000000000022F000-memory.dmp

Filesize
1020KB

Download
memory/3020-2-0x000000000019C000-0x000000000022F000-memory.dmp

Filesize
588KB

Download
memory/3020-3-0x0000000000130000-0x000000000022F000-memory.dmp

Filesize
1020KB

Download