isrstealer | 4c02165fb1a4c0871ef4ae7d77b89ea7b5d78d1b595da6652c43d4d2415201e9

General

Target

b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe
Size

4.3MB
MD5

b875f433838b5d7f6c841f738e689dcf
SHA1

5ed4202372264c08cdb808f6f0d4d1a28515f4f0
SHA256

4c02165fb1a4c0871ef4ae7d77b89ea7b5d78d1b595da6652c43d4d2415201e9
SHA512

77629e35cdddfd74e6df6f7777ad54e6621e5d3dab9e22cced56da40000e40b88fbf3b252286eee2430861c2a15a3032b517098eb5674d266c32e3395b71cfab
SSDEEP

6144:7/m9kF4LhB959Ak24Fa8yVRasuSuvfQ1dskAsaJraBCDorAB:bfFWB9bpFatVMPfgsVpraB

Score

10^/10

isrstealer credential_access discovery stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral2/memory/2712-3-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/2712-5-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/2712-19-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/2712-24-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/2532-8-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2532-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2532-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2532-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4332 set thread context of 2712	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	84
PID 2712 set thread context of 2532	2712	vbc.exe	85

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 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	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3376	PING.EXE
1836	cmd.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3376	PING.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2712	vbc.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 4332 wrote to memory of 2712	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	84
PID 4332 wrote to memory of 2712	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	84
PID 4332 wrote to memory of 2712	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	84
PID 4332 wrote to memory of 2712	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	84
PID 4332 wrote to memory of 2712	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	84
PID 4332 wrote to memory of 2712	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	84
PID 4332 wrote to memory of 2712	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	84
PID 4332 wrote to memory of 2712	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	84
PID 2712 wrote to memory of 2532	2712	vbc.exe	85
PID 2712 wrote to memory of 2532	2712	vbc.exe	85
PID 2712 wrote to memory of 2532	2712	vbc.exe	85
PID 2712 wrote to memory of 2532	2712	vbc.exe	85
PID 2712 wrote to memory of 2532	2712	vbc.exe	85
PID 2712 wrote to memory of 2532	2712	vbc.exe	85
PID 2712 wrote to memory of 2532	2712	vbc.exe	85
PID 2712 wrote to memory of 2532	2712	vbc.exe	85
PID 4332 wrote to memory of 1836	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	88
PID 4332 wrote to memory of 1836	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	88
PID 4332 wrote to memory of 1836	4332	b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe	88
PID 1836 wrote to memory of 3376	1836	cmd.exe	90
PID 1836 wrote to memory of 3376	1836	cmd.exe	90
PID 1836 wrote to memory of 3376	1836	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4332
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2712
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\aj2E3ML6Mu.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2532
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C ping 1.1.1.1 -n 1 -w 1000 > Nul & Del "C:\Users\Admin\AppData\Local\Temp\b875f433838b5d7f6c841f738e689dcf_JaffaCakes118.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:1836
- - C:\Windows\SysWOW64\PING.EXE
    ping 1.1.1.1 -n 1 -w 1000
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:3376

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\aj2E3ML6Mu.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/2532-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2532-21-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2532-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2532-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2532-8-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2712-3-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2712-5-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2712-19-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2712-24-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4332-0-0x0000000075192000-0x0000000075193000-memory.dmp

Filesize
4KB

Download
memory/4332-17-0x0000000075190000-0x0000000075741000-memory.dmp

Filesize
5.7MB

Download
memory/4332-2-0x0000000075190000-0x0000000075741000-memory.dmp

Filesize
5.7MB

Download
memory/4332-1-0x0000000075190000-0x0000000075741000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing