isrstealer | abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea

General

Target

abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe
Size

340KB
MD5

44a449ffdc8c450730e9d097425474a0
SHA1

fd67e32c19695accdd2be5c240b29db921d5b942
SHA256

abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea
SHA512

38170832b6c13147d221643cbaf0049b12fbbca96b65eb1816df404d5c92ec4efee8e12ed934890ac6f2e3e03fc2b1bfc7d810f4837172772991b85ef80aca3d
SSDEEP

6144:I5YEFGknycyAwrjpdgRCc32rmSz5bb0PEwI7QRKuE0Y1Cv:I5dRnyNPjpda72rm+/08SRKH0d

Score

10^/10

isrstealer collection 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 5 IoCs

resource	yara_rule
behavioral1/memory/904-59-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/904-61-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/904-62-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/904-72-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/904-85-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/396-80-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/396-81-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/396-80-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/396-81-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1596-66-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1596-70-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1596-71-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1596-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/396-75-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/396-79-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/396-80-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/396-81-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1596-84-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\S6bIXtKRzHJ.lnk	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe

Loads dropped DLL 1 IoCs

pid	Process
1232	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Cvtres.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1232 set thread context of 904	1232	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe	29
PID 904 set thread context of 1596	904	Cvtres.exe	30
PID 904 set thread context of 396	904	Cvtres.exe	31

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

System Information Discovery
T1082

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
904	Cvtres.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1232 wrote to memory of 904	1232	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe	29
PID 1232 wrote to memory of 904	1232	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe	29
PID 1232 wrote to memory of 904	1232	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe	29
PID 1232 wrote to memory of 904	1232	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe	29
PID 1232 wrote to memory of 904	1232	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe	29
PID 1232 wrote to memory of 904	1232	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe	29
PID 1232 wrote to memory of 904	1232	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe	29
PID 1232 wrote to memory of 904	1232	abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe	29
PID 904 wrote to memory of 1596	904	Cvtres.exe	30
PID 904 wrote to memory of 1596	904	Cvtres.exe	30
PID 904 wrote to memory of 1596	904	Cvtres.exe	30
PID 904 wrote to memory of 1596	904	Cvtres.exe	30
PID 904 wrote to memory of 1596	904	Cvtres.exe	30
PID 904 wrote to memory of 1596	904	Cvtres.exe	30
PID 904 wrote to memory of 1596	904	Cvtres.exe	30
PID 904 wrote to memory of 1596	904	Cvtres.exe	30
PID 904 wrote to memory of 1596	904	Cvtres.exe	30
PID 904 wrote to memory of 396	904	Cvtres.exe	31
PID 904 wrote to memory of 396	904	Cvtres.exe	31
PID 904 wrote to memory of 396	904	Cvtres.exe	31
PID 904 wrote to memory of 396	904	Cvtres.exe	31
PID 904 wrote to memory of 396	904	Cvtres.exe	31
PID 904 wrote to memory of 396	904	Cvtres.exe	31
PID 904 wrote to memory of 396	904	Cvtres.exe	31
PID 904 wrote to memory of 396	904	Cvtres.exe	31
PID 904 wrote to memory of 396	904	Cvtres.exe	31

C:\Users\Admin\AppData\Local\Temp\abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe
"C:\Users\Admin\AppData\Local\Temp\abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea.exe"
1⤵
- Drops startup file
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1232
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:904
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\Y67WbUcJcP.ini"
    3⤵
    PID:1596
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\HPJeicLqYG.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:396

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Roaming\DSILlzCwXB\cSrQ1Vb72t.exe

Filesize
340KB

MD5
44a449ffdc8c450730e9d097425474a0

SHA1
fd67e32c19695accdd2be5c240b29db921d5b942

SHA256
abc85701a272392c419cad7b04d5167cc40948f629967a4d782e5d265249b5ea

SHA512
38170832b6c13147d221643cbaf0049b12fbbca96b65eb1816df404d5c92ec4efee8e12ed934890ac6f2e3e03fc2b1bfc7d810f4837172772991b85ef80aca3d

Download Submit
memory/396-75-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/396-81-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/396-80-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/396-79-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/904-61-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/904-85-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/904-56-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/904-57-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/904-72-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/904-59-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1232-54-0x0000000075831000-0x0000000075833000-memory.dmp

Filesize
8KB

Download
memory/1232-74-0x0000000074260000-0x000000007480B000-memory.dmp

Filesize
5.7MB

Download
memory/1232-55-0x0000000074260000-0x000000007480B000-memory.dmp

Filesize
5.7MB

Download
memory/1232-83-0x0000000074260000-0x000000007480B000-memory.dmp

Filesize
5.7MB

Download
memory/1596-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1596-71-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1596-70-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1596-84-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1596-66-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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