isrstealer | 3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53c

General

Target

3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe
Size

4.8MB
MD5

f62e712524cf372a41e60689829ce5e0
SHA1

6c55af73c51e5737d7345a7736f8d2339b6bc07a
SHA256

3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53c
SHA512

4333a5d4f50ceb0fe937cb362e45df30010da3faeef33fab290182df0ae0ae0b0f30504591de4d375437bc1fbfe45acaf657d2b0ee81847c0a46c8f9de65dfd0
SSDEEP

6144:7/m9kF4LhB959Ak24Fa8yVRasuSuvfQ1dskAsaJraBCDorAB:bfFWB9bpFatVMPfgsVpraB

Score

10^/10

isrstealer 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/996-3-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/996-5-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/996-20-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/996-24-0x0000000000400000-0x0000000000435000-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-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe

Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4908 set thread context of 996	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	82
PID 996 set thread context of 1216	996	vbc.exe	83

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1216-8-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1216-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1216-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1216-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx

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	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	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.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
3416	cmd.exe
1852	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1852	PING.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
996	vbc.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 4908 wrote to memory of 996	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	82
PID 4908 wrote to memory of 996	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	82
PID 4908 wrote to memory of 996	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	82
PID 4908 wrote to memory of 996	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	82
PID 4908 wrote to memory of 996	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	82
PID 4908 wrote to memory of 996	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	82
PID 4908 wrote to memory of 996	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	82
PID 4908 wrote to memory of 996	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	82
PID 996 wrote to memory of 1216	996	vbc.exe	83
PID 996 wrote to memory of 1216	996	vbc.exe	83
PID 996 wrote to memory of 1216	996	vbc.exe	83
PID 996 wrote to memory of 1216	996	vbc.exe	83
PID 996 wrote to memory of 1216	996	vbc.exe	83
PID 996 wrote to memory of 1216	996	vbc.exe	83
PID 996 wrote to memory of 1216	996	vbc.exe	83
PID 996 wrote to memory of 1216	996	vbc.exe	83
PID 4908 wrote to memory of 3416	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	84
PID 4908 wrote to memory of 3416	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	84
PID 4908 wrote to memory of 3416	4908	3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe	84
PID 3416 wrote to memory of 1852	3416	cmd.exe	86
PID 3416 wrote to memory of 1852	3416	cmd.exe	86
PID 3416 wrote to memory of 1852	3416	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe
"C:\Users\Admin\AppData\Local\Temp\3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4908
- 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:996
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\1deUviJ3wt.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1216
- 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\3b1a47dd007d08a155a42c8736cff82b1a18f54b1e68cbfc6f3aa0da539cf53cN.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3416
- - 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:1852

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Persistence

Privilege Escalation

Defense Evasion

Credential Access

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\1deUviJ3wt.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/996-24-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/996-20-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/996-3-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/996-5-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1216-14-0x0000000000460000-0x0000000000529000-memory.dmp

Filesize
804KB

Download
memory/1216-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1216-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1216-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1216-8-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4908-0-0x0000000074CD2000-0x0000000074CD3000-memory.dmp

Filesize
4KB

Download
memory/4908-18-0x0000000074CD0000-0x0000000075281000-memory.dmp

Filesize
5.7MB

Download
memory/4908-2-0x0000000074CD0000-0x0000000075281000-memory.dmp

Filesize
5.7MB

Download
memory/4908-1-0x0000000074CD0000-0x0000000075281000-memory.dmp

Filesize
5.7MB

Download

Analysis

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