isrstealer | 1d03f8df088e33d558094c363d8e499557e7f96f3d31f699f776db61c29fb255

General

Target

49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe
Size

5.2MB
MD5

49b4d87aef4bb0a3f925860147b6bdc1
SHA1

857237fb27953167c1ec8ee01666a3920100ef02
SHA256

1d03f8df088e33d558094c363d8e499557e7f96f3d31f699f776db61c29fb255
SHA512

ffa4c7e4592b1434f389e229175cc88b9455a07507c80bf38e9f9ae1c8d9b9db40f1d184a4180e99607c8062693327ac445a67828e81bc96fe7503f93c6a70ad
SSDEEP

6144:7/m9kF4LhB959Ak24Fa8yVRasuSuvfQ1dskAsaJraBCDorAB:bfFWB9bpFatVMPfgsVpraB

Score

10^/10

isrstealer 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/3568-3-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/3568-5-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/3568-19-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/3568-23-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

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-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/620-8-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/620-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/620-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/620-15-0x0000000000400000-0x0000000000453000-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 3604 set thread context of 3568	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	84
PID 3568 set thread context of 620	3568	vbc.exe	85

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

System Information Discovery
T1082

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3724	PING.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3568	vbc.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 3604 wrote to memory of 3568	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	84
PID 3604 wrote to memory of 3568	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	84
PID 3604 wrote to memory of 3568	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	84
PID 3604 wrote to memory of 3568	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	84
PID 3604 wrote to memory of 3568	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	84
PID 3604 wrote to memory of 3568	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	84
PID 3604 wrote to memory of 3568	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	84
PID 3604 wrote to memory of 3568	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	84
PID 3568 wrote to memory of 620	3568	vbc.exe	85
PID 3568 wrote to memory of 620	3568	vbc.exe	85
PID 3568 wrote to memory of 620	3568	vbc.exe	85
PID 3568 wrote to memory of 620	3568	vbc.exe	85
PID 3568 wrote to memory of 620	3568	vbc.exe	85
PID 3568 wrote to memory of 620	3568	vbc.exe	85
PID 3568 wrote to memory of 620	3568	vbc.exe	85
PID 3568 wrote to memory of 620	3568	vbc.exe	85
PID 3604 wrote to memory of 4552	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	86
PID 3604 wrote to memory of 4552	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	86
PID 3604 wrote to memory of 4552	3604	49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe	86
PID 4552 wrote to memory of 3724	4552	cmd.exe	88
PID 4552 wrote to memory of 3724	4552	cmd.exe	88
PID 4552 wrote to memory of 3724	4552	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3604
- 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
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3568
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\uNBYm2dEwI.ini"
    3⤵
    PID:620
- 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\49b4d87aef4bb0a3f925860147b6bdc1_JaffaCakes118.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4552
- - C:\Windows\SysWOW64\PING.EXE
    ping 1.1.1.1 -n 1 -w 1000
    3⤵
    - Runs ping.exe
    PID:3724

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

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\uNBYm2dEwI.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/620-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/620-21-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/620-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/620-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/620-8-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3568-3-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3568-5-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3568-19-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3568-23-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3568-22-0x0000000000440000-0x0000000000509000-memory.dmp

Filesize
804KB

Download
memory/3604-0-0x00000000746D2000-0x00000000746D3000-memory.dmp

Filesize
4KB

Download
memory/3604-17-0x00000000746D0000-0x0000000074C81000-memory.dmp

Filesize
5.7MB

Download
memory/3604-2-0x00000000746D0000-0x0000000074C81000-memory.dmp

Filesize
5.7MB

Download
memory/3604-1-0x00000000746D0000-0x0000000074C81000-memory.dmp

Filesize
5.7MB

Download

Analysis

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