isrstealer | 0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc

General

Target

0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe
Size

318KB
MD5

d71366f5eece0973d076ecb08e4894b4
SHA1

5192fea16a9f8244d2e6a4eaaf87655cecd1f13f
SHA256

0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc
SHA512

3e00aaebe6d2c85c0ed0c4b1989bc3b2390c367aa4226758b5c8d3dee064e8003efacfdf10001752bb5578e2b431676e34eef80e8ad03edb3e3cdea2b56936dc
SSDEEP

6144:Ji3GW+lMXFj7cttK3JnSjTIJB6Jeht3h/dSYOY4IpQOvG8f1RRO:sl+c57c/KdWTIJ4JehttX7QOvHf

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 6 IoCs

resource	yara_rule
behavioral1/memory/1400-59-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1400-61-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1400-62-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1400-72-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1400-84-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1400-87-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/868-82-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/868-83-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/868-82-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/868-83-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1276-66-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1276-70-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1276-71-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1276-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1276-74-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/868-77-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/868-81-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/868-82-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/868-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\cb72t6bIX.lnk	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe

Loads dropped DLL 1 IoCs

pid	Process
1824	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Cvtres.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1824 set thread context of 1400	1824	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	29
PID 1400 set thread context of 1276	1400	Cvtres.exe	30
PID 1400 set thread context of 868	1400	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
1400	Cvtres.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1824 wrote to memory of 1400	1824	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	29
PID 1824 wrote to memory of 1400	1824	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	29
PID 1824 wrote to memory of 1400	1824	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	29
PID 1824 wrote to memory of 1400	1824	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	29
PID 1824 wrote to memory of 1400	1824	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	29
PID 1824 wrote to memory of 1400	1824	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	29
PID 1824 wrote to memory of 1400	1824	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	29
PID 1824 wrote to memory of 1400	1824	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	29
PID 1400 wrote to memory of 1276	1400	Cvtres.exe	30
PID 1400 wrote to memory of 1276	1400	Cvtres.exe	30
PID 1400 wrote to memory of 1276	1400	Cvtres.exe	30
PID 1400 wrote to memory of 1276	1400	Cvtres.exe	30
PID 1400 wrote to memory of 1276	1400	Cvtres.exe	30
PID 1400 wrote to memory of 1276	1400	Cvtres.exe	30
PID 1400 wrote to memory of 1276	1400	Cvtres.exe	30
PID 1400 wrote to memory of 1276	1400	Cvtres.exe	30
PID 1400 wrote to memory of 1276	1400	Cvtres.exe	30
PID 1400 wrote to memory of 868	1400	Cvtres.exe	31
PID 1400 wrote to memory of 868	1400	Cvtres.exe	31
PID 1400 wrote to memory of 868	1400	Cvtres.exe	31
PID 1400 wrote to memory of 868	1400	Cvtres.exe	31
PID 1400 wrote to memory of 868	1400	Cvtres.exe	31
PID 1400 wrote to memory of 868	1400	Cvtres.exe	31
PID 1400 wrote to memory of 868	1400	Cvtres.exe	31
PID 1400 wrote to memory of 868	1400	Cvtres.exe	31
PID 1400 wrote to memory of 868	1400	Cvtres.exe	31

C:\Users\Admin\AppData\Local\Temp\0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe
"C:\Users\Admin\AppData\Local\Temp\0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe"
1⤵
- Drops startup file
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1824
- 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:1400
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\BlTMJfAJdP.ini"
    3⤵
    PID:1276
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\KyazAyCRB2.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:868

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

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

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
\Users\Admin\AppData\Roaming\cSILlzC\fwXBSrQ1V.exe

Filesize
318KB

MD5
d71366f5eece0973d076ecb08e4894b4

SHA1
5192fea16a9f8244d2e6a4eaaf87655cecd1f13f

SHA256
0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc

SHA512
3e00aaebe6d2c85c0ed0c4b1989bc3b2390c367aa4226758b5c8d3dee064e8003efacfdf10001752bb5578e2b431676e34eef80e8ad03edb3e3cdea2b56936dc

Download Submit
memory/868-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/868-82-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/868-81-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/868-77-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1276-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1276-74-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1276-70-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1276-71-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1276-66-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1400-56-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1400-61-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1400-59-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1400-57-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1400-72-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1400-84-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1400-87-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1824-75-0x0000000074190000-0x000000007473B000-memory.dmp

Filesize
5.7MB

Download
memory/1824-54-0x0000000075F21000-0x0000000075F23000-memory.dmp

Filesize
8KB

Download
memory/1824-55-0x0000000074190000-0x000000007473B000-memory.dmp

Filesize
5.7MB

Download
memory/1824-86-0x0000000074190000-0x000000007473B000-memory.dmp

Filesize
5.7MB

Download

Analysis

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