expiro | cb973f86f75708e8e272a41a54d39a30f1da1e8ee21c59df1be074efdf55db01

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
04/12/2024, 21:06

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General

Target

c462fdaffc354a605a9e92167e64ee10_JaffaCakes118.exe
Size

417KB
MD5

c462fdaffc354a605a9e92167e64ee10
SHA1

9dfe38175d0195e992b867c74e595deaaea8b133
SHA256

cb973f86f75708e8e272a41a54d39a30f1da1e8ee21c59df1be074efdf55db01
SHA512

c10993502e6f01b4432a0e0ecdf6cdd58797d9abca0a982a5e31292fb63ef5074bbb6f44d20397fc9369610b58aaa2ff6eb9a8bbbde57bd76a9abbcba22a387f
SSDEEP

6144:/SpwTEOzPSK5U2SoJ8VWack2V1ZmXRWLgKocUq8nOfaIROo71YvK09lw+45B:K+IK5U2SoystmwLQcUqgsPBYv745B

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/1580-0-0x000000000128C000-0x000000000131F000-memory.dmp	family_expiro1
behavioral1/memory/1580-1-0x0000000001220000-0x000000000131F000-memory.dmp	family_expiro1
behavioral1/memory/1580-2-0x000000000128C000-0x000000000131F000-memory.dmp	family_expiro1
behavioral1/memory/1580-3-0x0000000001220000-0x000000000131F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2696	1580	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	c462fdaffc354a605a9e92167e64ee10_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1580 wrote to memory of 2696	1580	c462fdaffc354a605a9e92167e64ee10_JaffaCakes118.exe	30
PID 1580 wrote to memory of 2696	1580	c462fdaffc354a605a9e92167e64ee10_JaffaCakes118.exe	30
PID 1580 wrote to memory of 2696	1580	c462fdaffc354a605a9e92167e64ee10_JaffaCakes118.exe	30
PID 1580 wrote to memory of 2696	1580	c462fdaffc354a605a9e92167e64ee10_JaffaCakes118.exe	30

C:\Users\Admin\AppData\Local\Temp\c462fdaffc354a605a9e92167e64ee10_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\c462fdaffc354a605a9e92167e64ee10_JaffaCakes118.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1580
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1580 -s 68
  2⤵
  - Program crash
  PID:2696

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/1580-0-0x000000000128C000-0x000000000131F000-memory.dmp

Filesize
588KB

Download
memory/1580-1-0x0000000001220000-0x000000000131F000-memory.dmp

Filesize
1020KB

Download
memory/1580-2-0x000000000128C000-0x000000000131F000-memory.dmp

Filesize
588KB

Download
memory/1580-3-0x0000000001220000-0x000000000131F000-memory.dmp

Filesize
1020KB

Download